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Parasitology Exam Questions And Answers
|Latest 2025 | Guaranteed Pass.
1. What are some substances that will interfere with the examination of feces for ova and
parasites (O and P)? - Answer✔The administration of drugs or anti-diarrheal substances such as
mineral oil, barium, bismuth, magnesium and antibiotics should be terminated at least one
week before stool collection. These substances may interfere with the ova and parasite
examination by reducing the visibility of organisms.
2.How many specimens are usually examined for ova and parasites? - Answer✔1 a day for 3
consecuative day
3.Name several preservatives for fecal specimens for ova and parasites. - Answer✔10%
formalin, Polyvinyl alcohol, (SAF) sodium acetate formalin, (MIF) merthiolate iodine formalin
4.What is the disadvantage of mercuric chloride-based polyvinyl alcohol? - Answer✔It contains
mercury, it's poisonous and requires special handling and disposal
5.What guidelines should be followed regarding the number and timing of stool specimens for
routine O&P testing? - Answer✔No more than 2/3 specimens per patient should be submitted
and specimens should not be submitted from inpatients after the fourth day of hospitalization.
6.What are the recommended time limits for examination for formed, soft, and liquid stool
specimens for O and P? - Answer✔Liquid: within 30 min
Soft: within 1 hour
Formed: within 24 hours
7.What 3 examinations are usually performed on fresh stool specimen submitted for O&P
examination? - Answer✔Direct wet preparation, a concentration, permanent stained smear.
8.What is the purpose of the saline direct smear in the ova and parasite examination? -
Answer✔Study the motility of trophozoites. If there is a significant delay between collection of
the specimen and receipt in the lab.
1
Parasitology Exam Questions And Answers
|Latest 2025 | Guaranteed Pass.
1. What are some substances that will interfere with the examination of feces for ova and
parasites (O and P)? - Answer✔The administration of drugs or anti-diarrheal substances such as
mineral oil, barium, bismuth, magnesium and antibiotics should be terminated at least one
week before stool collection. These substances may interfere with the ova and parasite
examination by reducing the visibility of organisms.
2.How many specimens are usually examined for ova and parasites? - Answer✔1 a day for 3
consecuative day
3.Name several preservatives for fecal specimens for ova and parasites. - Answer✔10%
formalin, Polyvinyl alcohol, (SAF) sodium acetate formalin, (MIF) merthiolate iodine formalin
4.What is the disadvantage of mercuric chloride-based polyvinyl alcohol? - Answer✔It contains
mercury, it's poisonous and requires special handling and disposal
5.What guidelines should be followed regarding the number and timing of stool specimens for
routine O&P testing? - Answer✔No more than 2/3 specimens per patient should be submitted
and specimens should not be submitted from inpatients after the fourth day of hospitalization.
6.What are the recommended time limits for examination for formed, soft, and liquid stool
specimens for O and P? - Answer✔Liquid: within 30 min
Soft: within 1 hour
Formed: within 24 hours
7.What 3 examinations are usually performed on fresh stool specimen submitted for O&P
examination? - Answer✔Direct wet preparation, a concentration, permanent stained smear.
8.What is the purpose of the saline direct smear in the ova and parasite examination? -
Answer✔Study the motility of trophozoites. If there is a significant delay between collection of
the specimen and receipt in the lab.
1
