Exercise 3 Flashcards
Interfering substances
medications and substances
Oily laxatives
Antibiotics
medications
anti-diarrheal, antacids, anti-malarial agents
substances
bismuth and barium
crystalline residues
medications and substances
Oily laxatives
castor oil, mineral oil, or suppositories
retard the motility, distort morphology
Oily laxatives
affect the normal gastrointestinal flora
usually decreases the number of protozoans
feed on intestinal bacteria
Antibiotics
containers
clean, wide-mouth with tight-fitting lid
fit of the lid importance
prevent accidental spillage
maintain moisture
Integrity of the morphology of certain parasites are affected by
desiccation
Fecal sample should be collected without contamination with:
a. Urine
b. Toilet water and/or soil
may destroy protozoans especially the motile stages
a. Urine
may contain free-living organisms that can be mistaken for human parasites
b. Toilet water and/or soil
Volume of the fecal sample is dictated by the
technique
Volume for formed stool
a thumb-sized
Volume for watery specimen
1/2 teaspoon or 5-6 tablespoons
minimum number of specimen for routine examination
3 fecal samples
Times of Collection
separate days, every other day
within a 10-day period
likely to yield a higher percentage of positive samples
collection on alternate days
To ensure the recovery of parasitic organisms that are passed intermittently and in fluctuating numbers, the examination of a minimum of (?) collected over a (?) period is recommended
three specimens
7- to 10-day
Number of Specimens for intestinal amoebiasis
from normal bowel movement
after catharsis/purge
6 specimens
3
3
Number of Specimens for routine examination
normal bowel movement
after catharsis/purge
3 specimens
2
1
Number of Specimens post-therapy examinations
3 specimens
protozoan infection
checked 3–4 weeks after therapy
Taenia infection
examined 5–6 weeks after therapy
indicative of parasitic active infection
liquid stool
small possibility of tropozoite
soft/semi-formed stool
Critical Time Period for Examination for liquid stool
within 30 minutes of passage
Critical Time Period for Examination for soft/semi-formed stool
within 1 hour of passage
Critical Time Period for Examination for formed stool
at any time within 24 hours after passage
Fecal sample container label
i. Patient’s name and identification number, age, sex
ii. Date and time of specimen collection – crucial in transport processing
iii. Requesting physician
iv. Presumptive diagnosis
Requisition form
i. Patient’s name and identification number, age, sex
ii. Date and time of specimen collection – crucial in transport processing
iii. Requesting physician
iv. Requesting physician
v. Requested procedure
vi. Presumptive diagnosis
vii. Prior infection
viii. Travel history
