Transcript chemistry - Austin Community College

Urinalysis and Body Fluids
Unit 5
Seminal Fluid
CRg
Seminal Fluids - objectives
1.
2.
3.
4.
5.
6.
7.
Discuss the major components of seminal fluid with regard to source,
function, normal and abnormal appearance.
List three (3) reasons for semen analysis.
Outline instructions to give to a patient for the correct method for
collecting a semen specimen for laboratory analysis.
List two (2) methods for identifying a questionable fluid as semen.
State the significance of finding increased acid phosphatase in a
suspicious fluid.
Calculate a sperm count when provided with the number of sperm
counted, the dilution factor and the area of the counting chamber
used.
List the normal values for: semen volume, viscosity, pH, sperm count,
motility and morphology.
Seminal Fluids
• Composition of Semen
• Spermatozoa
• Fluids to provide nutritional support and media
% of total forDescription
or mechanism
delivery / Purpose
Spermatozoa
2-5%
Formed in testes, stored in epididymis
and vasa differentia
Seminal Fluid
60-75%
Alkaline fluid,; primarily responsible for
nutritional support through: amino acids,
enzymes, fructose. Also to suppress
possible immune response by female
Prostate Fluid
25-30%
Acid phosphatase, citric acid, proteolytic
enzymes and zinc
Bulbourethral
glands
1 – 5%
Galactose, mucous
Seminal Fluids
• Anatomy, composition and formation.
• Testes – source of sperm (2-5%)
• Seminal vesicles – provides fructose & nutrients and is
primary provider of fluid (@ 60-75%)
• Prostate gland – Provides enzyme, acid phosphatase, citric
acid, zinc, and proteolytic enzymes (for coagulation and
liquification). 2nd source of fluid(25-30%)
• Bulbourethral glands - @ 5%. Thick alkaline mucous-like fluid
that neutralizes acids.
Seminal Fluids
• Spermatozoa - produced in the testes,
mature in the epididymis.
Seminal Fluids
• Reasons for Testing
• Infertility issues – more often a problem with
the woman, but easy to rule-out the male.
• With assisted reproductive technology, greater
emphasis placed on sperm quality and quantity.
• Post- vasectomy – frequent reason for testing
• Test at one month intervals until 2 consecutive
months are negative for sperm.
Seminal Fluids
• Reasons for Testing
• Forensic analysis of fluid as being semen
• as in alleged rape.
• Vaginal swab, washings, or scrapings
microscopically evaluated for sperm
• chemical test for enzyme: acid phosphatase
o Contributed by prostate gland
o Present even in the absence of sperm cells
• Sperm donors - artificial insemination
programs
Seminal Fluids
• Specimen Collection
• Sterile container
• Direct deposit preferred
• no lubricants, spermacides, condoms, etc.
• Complete specimen
• Majority of sperm are in first part of ejaculate
• 3 day sexual abstinence required
• But not more than 5 days.
• Best if collected at laboratory site.
• If other, specimen must be kept warm and delivered
to lab within 1 hour
• Time of collection important.
• Must be recorded!
Seminal Fluids
• Physical characteristics
• Liquefaction – fresh specimen will clot,
then liquefy within 30 – 60 minutes
• Persistence of clot is abnormal
• All further evaluation must wait until
liquefaction is complete.
Seminal Fluids
Semen: Appearance
Opaque
Normal
Gray, white, light yellow
Shades of yellow
Correlate with flavin concentration
Deep yellow
Could also indicate contamination
with urine.
Associated with certain drugs
Brown or red
May contain blood
Highly turbid
Usually contains leukocytes
indicating infection or inflammation
Seminal Fluids
Semen: Appearance, cont.
Volume
2.0 – 5.0 mL
Measured in serological pipet
pH
Recorded to 1 decimal place
7.2 – 8.0
Measured with pH paper
Alkaline to off-set acid vaginal environment
Acid may indicate increased prostatic fluids
pH > 8 may indicate infection
Seminal Fluids
Semen: Appearance, cont.
Viscosity
Pours in droplets
(as shown in picture)
Rating: 0 = water-like
4 = gel-like
Semen: Microscopic Analysis
•
•
•
•
•
•
Motility
Concentration / cell count
Morphology
Agglutination
Viability
Penetration of cervical mucous
Semen: Microscopic Analysis
• Microscopic examination
• Generally performed 30 - 60 min after
collection
• Must be after liquidification has
occurred
• Motility
• Motility is a very necessary quality of sperm. Must
propel through uterus & fallopian tubes which is quite
a long distance.
• Must be evaluated within the 1st hour following
collection
• Will decrease over time
Semen: Sperm Motility
•
•
•
•
•
•
•
Analysis to begin within 1 hour of specimen
collection
Evaluation times may vary between labs, but usually
at set intervals
Consistency in technique and procedure important
Using hemocytometer & coverslip, examine a drop
of undiluted specimen using high dry objective.
Brightfield microscopy with light level reduced
Some labs use phase microscopy
Alternate method: High-resolution video
photography / CASA (computer assisted semen
analysis)
Semen: Sperm Motility
•
Manual Subjective evaluation
• Observe immediately following liquidfication; and within 1st
hour.
• Place well mixed undiluted drop on pre-warmed
hemacytometer slide
• Observe under high-dry objective; with reduced light.
• Rated from “0” to 4.0”
•
•
•
•
•
4.0 – rapid and straight line movement
3.0 – slower, and some lateral movement
2.0 – slow forward progression, noticeable lateral movement
1.0 – no forward progression
0 – no movement
• Other types of rating scales may be used
• Normal (authors vary greatly) but > 50-60% show 2.0 or
greater at 1 hour.
Semen: Microscopic Analysis
• Morphology
• May be performed in cytology, pathology, or
hematology
• Oval/egg shaped head (3x5um)
• While oval from the front, appears flattened when
viewed from the side appears flattened
• @ ½ covered with an enzyme laden acrosomal cap,
which contains
• Middle piece
• provides energy
• Tail piece of @ 45 – 55 um long
Semen: Microscopic Analysis
•
Morphology
• At least 200 cells evaluated on smear (Wright’s,
Giemsa or Papanicolaou) stained.
• Usually evaluated by pathologist, or cytologist
• Looking for double heads, pin heads, giant heads,
or amorphous heads, double, coiled, or missing
tails, etc.
• Many sources of good
pictures available
Semen: Microscopic Analysis
• Morphology
• Normal = < 30% abnormal forms
(NV varies considerably based
on strictness of criteria.
• WBC, RBC, bacteria presence
should be noted & may indicate
infection
• Round cells (neutrophils and
immature sperm) should be
noted as well.
Semen: Abnormal forms
• 2 headed sperm
• Sternheimer –
Malbin stain
• X 320
• Flat-headed sperm
Semen: Microscopic Analysis
• Sperm count
• NV= 20 – 160 million/mL
• Make 1 to 20 dilution with sodium bicarbonate and
formalin, count 5 small squares (within the center
large square) of the Neubauer hemacytometer.
Semen: Microscopic Analysis
• Sperm cell count
• standard method to begin calculation of #
cells (mature sperm) per microliter:
ave. # cells counted x dilution
# squares counted x volume of each square
Semen: Microscopic Analysis
• Microscopic examination
• Example: 52 cells (mature sperm) x 20
•
5 (squares) x 0.004
This provides results as ___ cells / uL;
Normal values are reported as ___ cells / mL
• Must multiply X 1000 to convert uL to mL
• = 52.0 x 106 / mL
Semen: Microscopic Analysis
•
Metric
• Internationalized system using decimals
• Common system of measuring units
• Length (M) , volume (L) , mass (G) , time (s), temperature (˚C)
• Prefixes allow for mL, uL, etc.
•
International System of Units (SI)
• Modified / modern form of metric system
• Has 7 base units (but, unlike the original metric system does
not include volume)
• Other units, such as volume are ‘derived’
• Basic unit for volume is m3
• mL = cubic centimeter (cumm), uL = cubic millimeter (mm3 )
Semen: Sperm Agglutination
• Observed while performing motility
evaluation.
• Few clumps are normal.
• Distinctly head-to-head or tail-to-tail
clumping may indicate the presence of
antisperm antibodies.
• IgG
• IgA
Semen: Sperm Viability
•
Eosin – Nigrosin stain
supravital stain
Add to drop of fresh sample
Smear is made and allowed to dry
Evaluated on oil immersion (1000x)
Viable / live sperm do not take up the stain and
remain colorless or blue-white
• Non-viable / dead sperm stain orange-red
•
•
•
•
•
• Reported as % viable
• Normal >75%
Semen: Analysis
•
Other tests
• Sperm penetration
• Evaluates ability of sperm to make progressive movement
through the cervical mucous.
• Microbial testing
• Increased WBC (>1 million/ mL) suggestive of infection
• Aerobic and anaerobic cultures
Semen: Chemical Analysis
•
pH
• Measure within 1 hour of collection
• Normal 7.2 8.0
•
Acid Phosphatase
• Used to evaluate the secretory function of the prostate
• Also used in forensic analysis – as prostatic fluid acid
phosphatase is higher than other fluids. (>200 units)
•
Fructose
• Provides energy / nutrition to sperm
• Indication of viability
• Presence of fructose – screen using resorcinol test
•
Hormones
• Testosterone, LH, FSH
Post- Vasectomy Analysis
• Post-vasectomy semen analysis
• Specimens tested at monthly intervals starting
2 months post-vas.
• 2 consecutive months of negative microscopic
for sperm
• Wet prep with phase microscopy
• Examination of centrifuged specimen as well
Semen: Forensic Analysis
•
Examination of fluid as to being semen
(forensic)
• Acid phosphatase – highly sensitive, as no
other body fluid contains as high level
(2500 units compared to @ 5 units)
• ABO, HLA typing
• DNA analysis
• UV light scan, semen fluoresces
green/white
Semen: Analysis QC
• Quality control
• Previously little or no QC materials available
• Commercial products now becoming available
• Proficiency testing now available
• CAP
• American Association of Bioanalysts (AAB)
Reference Listing




Please credit those whose work and pictures I have used throughout
these prsentations.
Lillian Mundt & Kristy Shanahan, Graff’s Textbook of Urinalysis and
Body Fluids, 2nd Ed.
Susan Strassinger & Marjorie Di Lorenzo, Urinalysis and Body Fluids,
5th Ed.
Wikipedia, the free encyclopedia
 www.wikibedia.org
Urinalysis and Body Fluids
CRg
Unit 5
2 Pregnancy & Amniotic Fluid Testing
Pregnancy Testing &
Amniotic Fluid - objectives
1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
Describe HCG, explain its role in pregnancy testing, and identify causes for
false negative and false positive results.
Analyze the formation, composition, and physiology of amniotic fluid.
State three (3) reasons for amniotic fluid analysis.
Describe tests performed on amniotic fluid to determine risk of Hemoyltic
Disease of the Fetus and Newborn (HDFN) and fetal maturity.
Define amniocentesis and list special precautions needed for this procedure.
Describe the handling and processing procedures for testing amniotic fluid.
Explain the principle of spectrophotometric analysis of amniotic fluid for
bilirubin and the interpretation of results as to level of risk to the fetus.
Evaluate the L/S ratio including its significance and normal value in a mature
fetus.
Identify the significance of phosphatidylglycerol and the “foam” or “shake”
test.
Explain the significance of alpha fetal protein and cytogenetic analysis of
amniotic fluid.
Urine Pregnancy Testing
•
Pregnancy tests detect the hormone produced in
pregnancy, beta-human chorionic gonadotropin
hormone (β-hCG).
• A natural hormone produced in very small quantities in all
persons, male / female.
• Following fertilization of an ovum, the special cells in the
chorionic layer of the developing placenta produce increased
amounts.
• Levels essentially double daily, until a peak level is normally reached near
the end of the first trimester.
• The hormone begins showing up in the urine @ 8-10 days after fertilization
(2-3 days after implantation of the embryo)
Urine Pregnancy Testing
•
Pregnancy tests detect the increased amount of, betahuman chorionic gonadotropin hormone (β-hCG).
•
Pregnancy testing can be done on blood or urine.
• Blood levels detected earlier and are more constant
• Urine levels vary depending upon the state of
hydration (first morning specimen or one that has
SpGr > 1.015)
Urine Pregnancy Testing (cont.)
•
Enzyme immunoassays (EIAs) are most popular
methodology.
• Can show a positive in as little as 10 days after conception.
• Example of how results are reported: hCG negative or hCG
positive
•
False results can occur
• False negatives – generally due to testing too early
• False positives
• Misinterpretation of results , not following directions
• Contamination with large amounts of blood, protein, bacterial
contamination
• True positive, but patient NOT pregnant
• Trophoblastic tumors, choriocarcinoma, germ cell tumors, etc.
Amniotic Fluid
Physiology, Composition and Formation
• Contained within the amnion
surrounding the fetus).
(The membranous sac
• Function
• Provides protective cushion
• Allows exchange of water, nutrients, biochemical
products
• Formed by
•
•
•
•
Maternal circulation/plasma (early)
Transfer of water across placental membrane
Metabolism of fetal cells
Fetal urine
• (after @ 36 weeks)
Amniotic Fluid
Physiology, Composition and Formation
• Volume
• 700-1200 mL @ 34 weeks.
• Composition
• Similar to maternal plasma with sloughed fetal
cells.
• Fetal urine increases creatinine, urea & uric
acid
• Rise in creatinine levels after 36th week can be used
to evaluate fetal age
o < 36 weeks = 1.5 – 2.0 mg/dL
o > 36 weeks = > 2.0 mg/dL
• Fetal lung secretions
• Lecithin & sphingomyelin surfactants.
Amniotic Fluid
•
Indications for analysis
• Abnormal screening blood tests: maternal alpha fetal
protein, human chorionic gonadotropin, unconjugated estriol
• Metabolic disorders, such as Tay Sachs
• Neural tube defects – such as spinal bifida or an encephalic
•
•
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Abnormal chromosome analysis and history of genetic
disorders - such as Down’s syndrome
Abnormal ultrasound
In later pregnancy for possible early delivery
• Fetal lung maturity, hemolytic disease of the newborn
(HDN), infection, confirmation of gestational age, fetal
maturity, etc.
Amniotic Fluid
• Specimen collection
• Amniocentesis (using ultrasound)
• 16-42 weeks gestation
• @ 20-30 mL through fine needle collected in
sterile syringes
• Immediately transfer into
sterile tubes
(brown colored for protection
from light)
• Puncture heals and liquid
replenished within 48 hrs.
Amniotic Fluid
•
General Handling and processing
• Special precautions
• Cytogenic study specimens at RT or 37 degrees
• Fetal lung maturity testing specimens must be kept cold
until tested
• Specimens for bilirubin testing must be protected from
light exposure and process immediately
• Other chemistry tests require separation of cells, etc.
from the fluid to preserve constituents.
Amniotic Fluid
• Color & Appearance
• Normally colorless – pale yellow
• Some turbidity is normal cellular debris, especially late in
fetal development period.
Amniotic Fluid
• Color & Appearance cont.
• Blood streaked - traumatic tap,
abdominal hemorrage, intraamniotic hemorrhage
• Fetal blood vs maternal blood: use
Kleihauer-Betke
• Yellow – bilirubin
• Dark green- meconium
• Dark red-brown –
• probable fetal death has occurred.
Amniotic Fluid testing
• Cytogenic analysis
• Determination of chromosomal abnormalities and certain metabolic
defects
• Picture by Clare O’Connor, PhD, Biology Dept., Boston College.
• Prenatal Screens Detects Fetal Abnormalities., Nature
Education.
Amniotic Fluid testing
• Cytogenic analysis
• Determination of chromosomal abnormalities and certain metabolic
defects
• Cells cultured
• Chromosomess evaluated for appropriate number and
completeness
• Some cells lysed and contents analyzed for enzymes to evaluate
for metabolic defects, such as Tay Sachs.
• Not done on all patients
• Patient is >35yrs. or has history of problems
• Increased AFP
• Known carriers.
Amniotic Fluid testing in HDN
•
Hemolytic Disease of the Newborn (HDN)
• Also called Hemolytic Disease of the Fetus and Newborn
(HDFN) or erythroblastosis fetalis.
• “classical” case: Rh-negative mothers with Rh+ infants
• Other red blood group discrepancies between Mom and Baby
can also produce HDN
• Fetal cells with antigen foreign to the Mom enter her
circulation and stimulate the production of antibodies.
• Danger increases with each exposure.
Amniotic Fluid testing
for Fetal Distress
•
Hemolytic Disease of the Newborn (HDN)
• Maternal antibodies cross the placenta and destroy fetal
cells with the corresponding antigen
• Bilirubin from RBC destruction appears in the amniotic fluid
• Some level occurs naturally from normal RBC catabolism
• The amount of unconjugated bilirubin present correlates with
the amount of RBC destruction
Amniotic Fluid testing
for Fetal Distress
•
Purpose of bilirubin testing on amniotic
fluid:
• Measurement of bilirubin is an indication of
degree of hemolysis occurring in utero,
therefore an indication of danger of anemia
in the fetus.
Amniotic Fluid testing
for Fetal Distress
• Bilirubin by spectrophotometric analysis
• Scan fluid at increasing wavelengths
• Plot readings against a baseline
• Measure difference between baseline and peak
bilirubin at 450 nn
Plot difference on Liley graph, against gestational age
Amniotic Fluid Testing
for Neural Tube Defects
•
Neural Tube Defects
• Anencephaly
• Spinal bifida
•
Tests
(these are usually tested together)
• Alpha fetal protein (AFP)
• Peaks at 16 weeks gestation
• Acetylcholinesterase
• **Test affected by presence of blood or hemolysis
Amniotic Fluid Testing
for Fetal Lung Maturity
-To determine whether fetus is capable of surviving an
early delivery.
• Hyaline membrane disease
• Also called neonatal respiratory distress syndrome
• Major complication of early delivery & Most common
cause for death of premature newborn.
• Immature lungs lack of lung surfactants, which allow lung
alveoli to be able to open during when breathing.
• Surfactants decrease surface tension, permitting alveoli
inflation.
• Fetal lung surfactants include three phospholipids:
• lecithin (also known as phosphatidylcholine), **major lung
surfactant.
• sphingomyelin,
• phosphatidyl glycerol.
•
Many tests developed to assess for fetal lung
maturity.
Amniotic Fluid Testing
for Fetal Lung Maturity
•
Shake test & Foam stability
• Both tests utilize dilutions of amniotic fluid in 95% ethanol and
look for formation of a persistent ring of foam / bubbles, an
indication of total surfactant concentration.
• Shake test – crude, fast, cheap and can be performed at bedside.
Physician can make an immediate decision regarding safety of early
delivery of infant.
• 1:2 dilution (amniotic fluid : 95% ethyl alcohol), shake 15 seconds,
If a complete ring of foam persists 15 minutes = positive test.
• Foam stability index – places fixed amount of amniotic fluid in
series of tubes with increasing amounts of 95% ethanol (from 0.43
to 0.55)
• Dilutions are shaken vigorously and the higher concentration of
95% alcohol that is able to suppress a foam ring is known as the
foam stability index
• Foam stability index >0.47 indicates fetal lung maturity
Amniotic Fluid Testing
for Fetal Lung Maturity
• Lamellar bodies
• “packets” of surfactant lipids produced by
pneumocytes
• Size 1-5 um (slightly smaller than platelets)
• Can run on automated cell counters (platelet
mode)
• Lamellar body count > 30,000 / uL is highly
predictive of pulmonary maturity
• Count < 10,000 suggest risk for RDS –
respiratory distress syndrome
• Test not affected by hemolyzed blood or
meconium
Amniotic Fluid Testing
for Fetal Lung Maturity
•
Lecithin / Sphingomyelin ratio
• Lecithin is the major lung surfactant
• The role of sphingomyelin is not established
• Levels equal until 33 weeks of gestation
• @ 1/1 ratio
• After 34 the week of gestation, lecithin
production greatly increases as compared to the
sphingomyelin
• L/S ratio 2.0 or greater indicates lung maturity
• 2X as much lecithin / spingomyelin
Amniotic Fluid Testing
for Fetal Lung Maturity
• Phosphatidyl glycerol
• Not detected until 35 week of gestation
• Delayed in cases of maternal diabetes
• Amniostat FLM - PG
• Immunological test for phosphatidyl glycerol
• Uses antibodies for detection, thereby not
affected by the presence of hemolysis or blood
Amniotic Fluid Testing
for Fetal Lung Maturity
• Microviscosity
• Fluoresent dye binds with surfactants and
albumin.
• Test run on Abbot TDx and results correlate
well with L / S ratio
Amniotic Fluid Testing
• Creatinine
• Fetal age determination (at 36 weeks, fetal
kidneys excrete >2.0 mg/dL creatinine)
•
• This test has been replaced by ultrasound
measurements.
Creatinine still used as:
• Measurement as means of determining a fluid to
be amniotic or urine.
• Creatinine level up to 3.5 mg/dL & urea level @ 30
mg/dL can be found in amniotic fluid
• Urine levels of creatinine @10 mg/dL and @ 300
mg/dL for urea.
Urinalysis and Body Fluids
CRg
Unit 5
3 Sweat Fluid Analysis
Sweat Fluid Analysis - objectives
1. Define cystic fibrosis (CF).
2. Describe the methodology of the sweat chloride
test.
3. Analyze the sweat chloride values seen in patients
suspected of having CF
Cystic Fibrosis (CF)
•
Cystic fibrosis
• 1/25 white Americans are carrier of CF gene
• Autosomal recessive, affects @ 1/1500 – 1/2000
Caucasian births.
• Most common fatal inherited disease of Americans
• 1000 new cases diagnosed / year
• Most patients diagnosed before 2 years of age
• If diagnosed early, many will live to adulthood; but @ ½
die before age of 30.
• Affects mucous secreting glands
• Very thick mucous produced
• Lungs, pancreas, GI tract, sweat glands
CF – Symptoms vary:
•
CF Symptoms
• Coughing due to respiratory distress & frequent lung
infections
• Viscous stools cause GI obstructions
• Pancreatic insufficiencies
• Leads to frequent greasy, bulky stools
• Failure to thrive
• Salty –tasting skin
CF – Treatments vary:
•
CF Treatments:
• Mycolytic agent
• Bronchodilator to liquefy and expedite removal of mucous from
lungs
• Antibiotics
• Anti-inflammatory medications such as ibuphrofen
• Physical therapy – breathing exercises
Sweat test - Laboratory Procedure
• (Pilocarpine iontophoresis)
• Pilocarpine – chemical that will induce sweating
• Iontophoresis – mild electrical current
• http://www.cff.org/AboutCF/Testing/SweatTest/
Sweat test - Laboratory Procedure
• (Pilocarpine iontophoresis)
• Pilocarpine – chemical that will induce sweating
• Iontophoresis – mild electrical current
Clean area
Induce new sweat formation
Collection on filter paper OR Collection in tube OR
Directly measure on skin with chloride ion selective electrodes /
ISEs
• Test sweat for chloride concentration
•
•
•
•
• http://www.cff.org/AboutCF/Testing/SweatTest/
Sweat Testing
• Results:
• Normal Sweat chloride levels < 30 mEq/L
(mmol/L)
• Sweat chloride levels of 40-70 mEq/L are
borderline and must be repeated.
• Sweat chloride (or sodium) levels greater than
50 mEq/L are consistently seen in 98% of CF
patients.
Reference Listing





Please credit those whose work and pictures I have used throughout
these prsentations.
Lillian Mundt & Kristy Shanahan, Graff’s Textbook of Urinalysis and
Body Fluids, 2nd Ed.
Susan Strassinger & Marjorie Di Lorenzo, Urinalysis and Body Fluids,
5th Ed.
Wikipedia, the free encyclopedia
 www.wikibedia.org
Cystic Fibrosis Foundation
 www.cff.org/About CF/
Urinalysis and Body Fluids
CRg
Unit 5
4 Gastric Fluids
Gastric Fluid Analysis - objectives
1. Describe the physiology and composition of gastric
fluid; including the role of gastrin in its production.
2. List two (2) reasons for gastric fluid analysis.
3. Explain the special patient preparation that should
occur before gastric fluid is analyzed.
4. Define or describe the Zollinger-Ellison Syndrome,
anacidity, hypochloryhydia, and achlorhydria.
5. Describe the procedure for gastric acidity and
state the clinical significance.
6. Describe gastric fluid drug screening and its clinical
significance.
Gastric Fluid - production
• Physiology
• Full stomach, presence of amino acids, stimulation
by vagus nerve, other factors
• Release of hormone Gastrin from stomach G cells
• Gastrin stimulates release of digestive gastric
fluids from the stomach parietal cells.
• Inhibition / shut-down
• Negative feed-back system
• Presence of secreted HCl in stomach will inhibit gastrin release
• Hormones somatostatin, glucagon, calcitonin and others
Gastric Fluid - composition
• Composition and formation
• Produced by the parietal cells in the stomach
under the hormonal influence of gastrin.
• Normal makeup of gastric fluid:
•
•
•
•
•
* HCl,
saliva,
mucous,
neutralizing chemicals,
secretions from the intestines, bile & pancreas
Gastric Fluid
•
Anacidity – lack of normal acidity
• Sometimes called achlorhydria (hypochlorhydria)
• Absence (decrease) of HCl in gastric secretions
• Usually caused by
•
•
•
•
Atrophy of gastric mucosa
Gastric carcinoma
Pernicious anemia
Severe iron deficiency anemia
Gastric Fluid testing
•
Indications for testing gastric fluids
• Peptic ulcer evaluation
• Gastritis – inflammation of stomach wall
• Anacidity – inability to produce acid
Gastric Fluid testing
•
Indications for testing gastric fluids
• Zollinger-Ellison (Z-E) syndrome
• Hypersecretion
• Gastrin secreting neoplasm usually located within the
pancreatic islets
• Drug analysis
• Suspicion of recent overdose
• Examination of gastric fluid / aspirate for presence of
pills, capsules, etc. generally performed by attending
physician, or perhaps pathologist.
• Literature provides some information regarding
quantatitive testing, ie. HPLC, GLC/Mass Spectroscopy.
Gastric Fluid testing
•
•
•
Specimen collection
• Nasal or oral intubation
• Fasting & avoid swallowing saliva
Normal Specimen
• ≤ 75 mL
• Translucent, light gray
• Slightly viscous
Laboratory procedures
• Gastric acidy (acid <4.0)
pH paper
• Drug screening
Reference Listing







Please credit those whose work and pictures I have used throughout
these prsentations.
Lillian Mundt & Kristy Shanahan, Graff’s Textbook of Urinalysis and
Body Fluids, 2nd Ed.
Susan Strassinger & Marjorie Di Lorenzo, Urinalysis and Body Fluids,
5th Ed.
Wikipedia, the free encyclopedia
 www.wikibedia.org
Mosby’s Medical Dictionary, 8th edition. @ 2009 Elsevier.
Clinical Chemistry, Vol 22, 1906-1909. by American Association of
Clinical Chemistry.
Pub Med.gov. U.S. National Library of Medicine, National Institutes of
Health.
Urinalysis and Body Fluids
CRg
Unit 5
5 Feces & miscellaneous
Feces
• Feces
• Composition
•
•
•
•
•
Bacteria,
Cellulose & other undigested foodstuffs
GI secretions, enzymes, bile pigments
Cells
Electrolytes and water
Overview of Indications for Fecal Testing
•
GI bleeding
• Occult blood
•
Suspicion of pathogenic bacterial or
parasitic infections
• Microscopic exam for leukocytes
• O&P
• Stool cultures
•
Diagnosis / confirmation of a malabsorption
syndrome or liver and biliary duct disorder
• Fecal fat & Fecal Carbohydrates
• Meat fibers
•
Fetal hemoglobin
Diarrhea
• Diarrhea
•
•
•
•
Common disorder of the GI tract
Increased frequency (> 3x / day)
Increased amount (>200 gm stool wt / day)
Associated with infections, toxins,
malabsorption issues, etc.
Diarrhea
• Diarrhea
• Mechanisms of diarrhea:
• 1. Secretory
• Microbial infections
o
o
o
o
o
o
o
o
Vibrio cholerae
Some E. coli
Clostridium
Salmonella
Shigella
Staphylococcus
Campylobacter
Cryptosporidium
• Drugs, laxatives
• Inflammatory bowel disease / colitis
• Endocrine disorders, malignancy, others
Diarrhea
• Diarrhea
• Mechanisms of diarrhea:
• 2. Osmotic imbalance
•
•
•
•
Incomplete digestion / absorption
Lactose intolerance
Amebiasis, antibiotics, laxatives, antacids
Irritable bowel syndrome, others
Diarrhea
• Diarrhea
• Mechanisms of diarrhea:
• 3. Altered motility
• Hypermotility with decreased absorption
• Irritable bowel syndrome, others
• Ramifications – diarrhea can easily result in
dehydration and critical electrolyte
imbalances.
Other Disorders of the GI Tract
•
Malabsorption
• Abnormal digestion or absorption of one or more
nutrients
• May lead to malnutrition or anemia
•
Maldigestion
• Impaired digestion due to lack of digestive
enzymes
Other Disorders of the GI Tract
•
Colorectal cancer
• Relatively common cancer of GI tract
• Associated with ‘occult’ / hidden blood loss
•
Pancreatic insufficiency and cystic fibrosis
• Decreased pancreatic digestive enzymes
• Trypsin
• Chymotrypsin
• Elastase I
• Results in maldigestion
Fecal Specimen Collection
•
•
•
•
•
•
Patient needs detained instructions
Clean container, avoid contamination with urine or
toilet water
Qualitative tests require only small amount of
random sample
Quantitative / timed specimens, may require
collection over several days. May require entire
sample during the time period (72 hr fecal fat) or
small amounts taken over several days (O& P)
In some tests, timing of collection is important
Some tests require restrictions of diet (occult
blood)
Fecal Laboratory Procedures
Color / Appearance
Possible Cause(s)
Brown (normal)
Normal – presence of urobilin (from bacterial
breakdown of urobilinogen / stercobilinogen
Black
*Upper GI bleeding, Iron therapy, or some medications
Red
*Lower GI bleeding. Beets, food coloring & some meds.
Pale yellow, white,
gray
Giardia infection. Bile – duct obstruction. Barium
sulfate
Green
Strongly green vegetables. Some oral antibiotics.
Biliverdin
Bulky / frothy
Bile-duct obstruction. Pancreatic disorders
Ribbon-like
Intestinal constriction
Colitis, dysentery, malignancy, constipation
Mucous /blood
streaked
*Color varies shades of red to black depending upon where bleeding
occurs in the GI tract.
Fecal Laboratory Procedures
• Microscopic Examination for WBC
• Fecal leukocytes
• Mucous with blood / pus often seen in dysentery
and damage to intestinal wall.
• Methylene blue, Wrights or Gram stain may be used
to visualize WBCs.
• Wrights best for cell differentiation
• Can indicate pathogenic bacterial infection or
ulcerative colitis
• Neutrophils associated with bacterial infection
• Eosinophils associated with amebic infestation.
Fecal Laboratory Procedures
• Microbiology tests
• Gram stain – not much help. Stool full of
gram negative rods (mostly E. coli.)
• Cultures – must use selective media which
restricts or prohibits the growth of normal
flora, and allows pathogens to grow.
• Salmonella, Shigella, Campylobacter, Yersinia,
E. coli 0157, Clostridium difficile
Fecal Laboratory Procedures
• Microbiology tests
• Ova & Parasites
•
•
•
•
•
•
•
Giardia
Enterobius vermicularis (pinworm)
Taenia sagenata
Taenia solis
D. latum
H. nana .. Tapeworms
Ascaris
Fecal Laboratory Procedures
• Blood in feces
• Melana
• A large amount of fecal blood
• May be black, tarry stool
• Lower GI tract bleeds usually bright red blood if
not occult
Fecal Laboratory Procedures
• Fecal Occult Blood Testing (FOBT)
• “Occult” = hidden
• Detection of occult blood may indicate
• Infection / inflammation / ulcers of GI tract
• Intestinal Trauma / hemorrhoids / Bleeding gums
• Colorectal cancer
•
The American Cancer society recommends testing
on all those over age 50 years.
Fecal Occult Blood Testing (FOBT)
• Two samplings from 3 consecutive stools for a negative
• Traditional screening tests based on detection of the
*pseudoperoxidase activity of hemoglobin
• Different chromagens have been used
• Benzidine (most sensitive), ortho-toluidine, & *gum guaiac (least
sensitive, but preferred as to limit false positives)
• Hydrogen peroxide oxidizes a colorless compound to for a blue
color.
• View demonstration at:
http://www.operationalmedicine.org/ed2/Video/Hemoccult.mpg
Fecal Laboratory Procedures
•
Stool guaiac test / gFOBT
• Diet restrictions
•
•
•
•
No red meats, fish
Turnips , Horseradish
Melons, banannas, pears, plums
Raw broccoli, & cauliflower
• Other restrictions
• No aspirin or other non-steroidal anti-inflammatory
medications for @ 7 days prior to collections to prevent
GI irritation
• iron supplements avoided for 3 days
• High Vitamin C levels will reduce (False negative Rx)
peroxidase activity
iFOBT
•
•
Immunochemical fecal occult blood (iFOBT)
Fecal Immunochemical Testing (FIT)
• Hemoccult ICT(commercial product name)
•
•
•
•
Specific for globin portion of human hemoglobin
Uses anti-human hemoglobin antibodies
No dietary or drug restrictions
Most sensitive to lower GI bleeding (patients with upper GI bleeding,
such as ulcer would not react as blood has been digested)
• Although many studies are in progress comparing the iFOBT
and the traditional guiac , this test is quickly replacing the
traditional fecal occult blood test!
Feces - fecal fat
• Fecal Fat – steatorrhea
• Notable characteristics
• Floats in water
• Pale and greasy oily appearance
• Foul-smelling
• Causes
• Decreased production of pancreatic enzymes
• Absence of bile salts
• Malabsorption syndromes
•
•
•
•
bacterial overgrowth, intestinal resection
celiac disease, tropical sprue
lymphoma,
Crohn disease, Whipple disease, and giardiasis.
Feces - fecal fat testing
•
Patient preparation
• Normal diet with normal level of fats
• No contamination by oils, suppositories, or creams
(could cause false positives)
•
Qualitative method
• 2 procedures
• Neutral fats (triglycerides)
• Soaps and fatty acids
• Sudan III/IV or Oil red O stain
• Examine microscopically for large orange - red fat
droplets.
Feces - fecal fat testing
•
Quantitative method
• To follow up a positive quantatitive test
• Dietary requirements
• Requires adherence to a diet of 100g/ day fat intake
before and during test collection.
• Chemistry dept – usually sent to reference lab
• 3day collection (72 hours)
• Test methods
• Van de Kamer – classical titration Use sodium hydroxide
to chemically titrate the amount of fat.
• Acid steatocrit
• Near infra-red spectroscopy
Feces
•
APT - fetal hemoglobin
• To determine whether blood found in newborn’s vomitus or
stool is their own, or from the Mom.
• Testing makes use of fact that baby blood (Hgb F) cells are
resistant to lysing with sodium hydroxide & remain pink, while
mom adult (Hgb A) cells lyse changing from the pink to yellow
- brown.
Feces
•
Fecal enzymes
• Pancreatic insufficiency & cystic fibrosis
• Pancreatic – associated enzymes
• Trypsin
• Classic trypsin test – series of diluted stool specimens are placed
on x-ray paper (has a gelatin coating). After incubation, the stool is
rinsed off and the paper evaluated to determine the dilution at
which no gelatin has been digested by the protease trypsin . TEST
NOT SENSITIVE
• Chymotrypsin – more sensitive and can be measured
spectrophotometrically
• Elastase I
• pancreas specific enzyme not affected by motility or other
mucosal issues
• Immunoassay procedure provides higher degree of specificity
Feces - Fecal Carbohydrates
•
Fecal carbohydrates.
• Celiac disease – inability to absorb carbohydrates
• Lactose intolerance – lack enzymes to digest
• Inflammatory necrotizing entrocolitis – rare, but very
serious condition, most often occurs in premature infants
• Increased carbohydrates in stool results in osmotic
diarrhea.
• Disaccharides (lactose is example) in the large intestine and
bowel are osmotically active and cause movement of a large
amount of water into the intestine.
• Clinitest to detect the carbohydrate
• Fecal pH to determine increased acid level
• Stool pH normally @ 7-8
• pH 5.5 – 6 indicates increased acid
Bronchial Washings & Bronchoalveolar Lavage
• Fiberoptic bronchoscope placed in airway can be used
to obtain specimen.
• Or sterile saline infused (lavage procedure) and
retrieved for analysis. - Results may be as good as
biopsy.
• Specimens usually sent to cytology / pathology to be
examined for malignancy.
• Occasionally, they are examined for other cells:
• macrophages (60-80%),
• lymphs,
up to 10%
• neutrophils up to 21%
• eosinophils < 1 %
• bronchial epithelial cells,
• squamous cells
• OR, more often cultured for microorganisms.
Other miscellaneous fluids.
• Nasal smears
• Hansel stain for eosinophils
• Cyst fluids – cells, and organisms
• Tears – eosinophils
• Breast milk – eosinophils.
• always can culture them.
Reference Listing




Please credit those whose work and pictures I have used throughout
these prsentations.
Lillian Mundt & Kristy Shanahan, Graff’s Textbook of Urinalysis and
Body Fluids, 2nd Ed.
Susan Strassinger & Marjorie Di Lorenzo, Urinalysis and Body Fluids,
5th Ed.
Wikipedia, the free encyclopedia
 www.wikibedia.org
Urinalysis and Body Fluids
Unit 5
6 Vaginal Secretions
CRg
Vaginal Fluids - objectives
1.
2.
3.
4.
5.
Define and list at least three (3) symptoms of vaginitis.
Identify at least two (2) sources of error that can occur during the
collection and processing of vaginal wet prep specimens.
List three (3) common causes of infectious vaginitis.
Describe "clue cells" and explain the significance of finding them in a
vaginal wet prep.
Evaluate the test for estrogenic activity including the appearance of
positive and negative results.
Vaginal Secretions
•
Normal secretions
• Clear mucus
• May turn slightly white or pale yellow when exposed to
air
• Healthy vagina - Lactobacillus species
predominates
• pH< 4.5 (3.8-4.5)
• Amount / volume varies through menstrual cycle
• Normal microscopic exam
•
Abnormal changes
• Color
• Consistency
• Amount
Normal Wet prep
• No symptoms
• Lactobacillus (normal)
• Normal discharge
108
Vaginitis
•
Vaginitis
• - inflammation or infection of the vulva and vagina
• NOT a specific disease, but is a very common
reason women seek medical attention
• Estimated 1/3 to ½ outpatient visits by women
• Can occur in all age groups, sexually active as well as
sexually non-active.
• Common symptoms
•
•
•
•
•
Vaginal discharge
Foul smell
Itching
Spotting
Pain
109
Vaginitis - evaluation
•
Patient history
• Marital or relationship status
• Timeline of when symptoms began, etc.
•
•
•
Symptoms / complaint(s)
Physical examination
Tests
•
•
•
•
•
Physical properties
Vaginal pH
Microscopic exam / Wet Prep
Amine (Whiff) test
Cultures, if warranted
110
Vaginitis
• Two (major) types
• Non- infectious
• May be caused by soaps ( no bubble baths ladies !),
chemicals, foreign objects, allergies to condoms /
lubricants etc.
• Infectious (makes up 90% of all cases)
• Fungal / yeast
• Parasitic – Trichomonas vaginalis
• Bacterial
111
Vaginitis
•
Specimen – Vaginal Wet Prep
• Sterile swab (moistened with normal saline)
• Must process these immediately, ie within 5 minutes
• Swab in tube with @ ½ mL normal saline, or Ringer’s
lactate
• Keeps organisms from drying out if delay is expected
• Special collection procedures: Microbiology cultures for
gonorrhea (GC) must be placed in special transport media
immediately.
• This microbiology testing being replaced by molecular diagnostics
• Collection / processing errors
• Insufficient specimen / poor collection
• Swabs / slide drying out
112
Vaginitis - testing
•
vaginal pH
• Most important preliminary test
• Normal (childbearing age) < 4.5
• pH paper
113
Vaginitis - testing
•
Microscopic exam / Saline Wet Prep
• Sample mixed with saline examined microscopically
to look for
• Budding yeast with elongated pseudohyphae
• Motile trichomonads & increased segmented neutrophils
• PMNs & Clue cells
114
Vaginitis - testing
•
Microscopic exam / Saline Wet Prep
• Limitations
• Skill of collection
• Transport time
• Trichomonas organisms die / become immotile
• Skill of technician
• New wave in laboratory testing
• Immunologic
• Molecular diagnostic / pcr
115
Vaginitis - testing
•
Amine (Whiff) test
• Also called potassium hydroxide or KOH
preparation
• Vaginal fluid & 10% KOH placed on a slide
• Fumes from the slide are smelled to detect
presence of ‘fishy odor’ (trimethylamine) .
• Presumptive for bacterial vaginosis, though can
also be positive for trichomonal vaginosis
116
Vaginitis - suspect yeast (candidiasis)
•
Candida albicans
• Commonly causes a majority of cases
• Alteration of normal vaginal flora
o antibiotic regimens
o immunocompromised patients
• Thick white, clumpy or “curd-like” discharge.
• Laboratory findings
• Normal vaginal pH
• Identification of yeast cells and elongated
pseudohyphae (mycelia forms)
• saline wet mounts
• 10% KOH wet preps
• Gram stain
117
Vaginitis - suspect:Trichomonas vaginalis
• Trichomonas vaginalis • Parasitic vaginitis
Free- living organism
• Swimming / bathing in contaminated water
• Sexually transmitted
• Symptomatic - Yellow-Green frothy discharge;
or may be asymptomatic
• Organism seen in urine or on wet-prep
• In males – sexually transmitted urogenital
infection
• Usually asymptomatic
• Organism may be detected in urine microscopic
T. vaginalis - testing / detection
•
Laboratory findings
• Wet-prep microscopic
• Single celled flagellate demonstrating jerky movements
• @ size of WBC, but no nucleus and actively motile - unless
specimen is old, dry or cold.
• May demonstrate WBCs
•
•
•
DNA and immunological tests
Elevated vaginal pH
Positive amine / “whiff” test
Vaginosis – suspect bacteria
•
•
•
Healthy vagina - Lactobacillus species predominates
Bacterial vaginosis
• Gardnerella vaginalis
• Mobiluncus species
• Prevotella species (anaerobes)
Characteristics (*Amsel criteria)
• *Homogenous vaginal discharge
• Amount & Color may vary, but often gray / off-white
• Usually thin in consistency and malodorous.
• Lack of WBCs, but increased epithelial cell exfoliation
• *“Clue cells” (make up 20+%) – most reliable finding
• *Vaginal pH > 4.5
• *Positive amine test in the KOH prep
“Clue cells”
Normal examples
Clue cells
121
Vaginitis – testing summary
Observation /
test
Candidia
vaginatis yeast
Trichomonas
vaginalis
Bacterial
Appearance
Thick white,
clumpy / curdlike
Green-yellow &
frothy
Thin, gray
homogenous
pH
< 4.5
>4.5
> 4.5
Wet Prep
microscopic
Budding yeast
and
pseudohyphae
Motile
trichomonads &
PMNs
> 20% Clue cells
identified
Amine (Whiff)
test with 10%
KOH
Negative
Negative, or
Positive
Positive: fishy
odor
DNA &
immunological
tests available
Amsel criteria: at
least 3 of 4 must
be positive.
Miscellaneous
122
Summary
• From the lab’s perspective – 3 main
causes for vaginitis
• Yeast infection / candidiasis
• Candidia albicans / other species possible
• Trichomonas vaginalis
• Bacterial
• From disturbance of normal flora (ie decreased
lactobacillus) that allows overgrowth of mixed
flora, ie Gardnerella vaginalis and others
• Gardnerella – results in ‘clue cells’
• Known pathogens, ie gonorrhea
123
Fern test
• Test for estrogenic activity
• Cervical mucous smeared on glass slide
and allowed to dry
• Examine under the microscope – look for
fern-like appearance / pattern
• Seen during times of increased estrogen – as
occurs at time of ovulation.
• Also done to see if there has been premature leakage of amniotic fluid - as it will
also make a fern pattern due to its protein
and sodium chloride content.
124
Fern test – positive reactions
125
Fern test – negative reaction
126
Wet preps - 1
• No symptoms
• Lactobacillus (normal)
• Normal discharge
127
Wet preps - 2
•
•
•
•
•
pH <4.5 (normal)
KOH microscopic negative & Whiff test
negative (no amine odor)
Normal epithelial cells
Predominately lactobacillus
Rare WBC
128
Wet preps - 3
•
•
•
•
•
Positive clue cells
pH > 4.5
Whiff test positive
KOH microscopic negative
Normal lactobacilli have been
overrun by Gardnerella
vaginalis and other organisms
129
Wet preps - 4
• Positive KOH microscopy
• Whiff test negative
• No amine odor when mixed
with the KOH
• Vaginal pH <4.5
• Moderate – increased
discharge
• White to light yellow,
• Etiology – Candida albicans /
Candida species
130
Wet preps - 5
•
•
•
•
Microscopy – positive for motile ‘trich’
Whiff test often positive
Vaginal pH >5.0
Discharge – greatly increased
• Green / yellow purulent, may appear foamy
• Etiology – Trichomonas vaginalis
131
Summary
• Yeast - Candidiasis
• Candida albicans / other species possible
• Microscopic shows mycelia forms
132
Summary
• Trichomoniasis
• Trichomonas vaginallis
• @ size of WBC (slide on Rt), but no nucleus
and actively motile
• Unless specimen is old, dry or cold
133
Reference Listing





•
•
Lillian Mundt & Kristy Shanahan, Graff’s Textbook of Urinalysis and
Body Fluids, 2nd Ed.
Susan Strassinger & Marjorie Di Lorenzo, Urinalysis and Body Fluids,
5th Ed.
Wikipedia, the free encyclopedia
 www.wikibedia.org
eMedicine from Webb MD
 http://emedicine.medscape.com/article/257141-diagnosis
Family Practice notebook.com
Amsel R, Totten PA, Spiegel CA, Chen KC, Eschenbach D, Holmes KK.
Nonspecific vaginitis. Diagnostic criteria and microbial and
epidemiologic associations. Am J Med. 1983 Jan;74(1):14-22. [Medline]
Seattle STD/HIV Prevention and Training Center, Washington State
Dept. of Health
•
•
http://depts.washington.edu/nnptc/online_training/std_handbook/gallery/pages/cluecel
ls.html