12 Questions
What is the advantage of using ethyl acetate in the centrifugation technique described?
Improves the recovery of most parasites
Why is zinc sulfate centrifugal flotation technique preferred over other methods?
Removes more fecal debris from the preparation
What is a disadvantage of using zinc sulfate centrifugal flotation technique?
May miss some helminth eggs that are very dense
Why is Sheather's flotation method recommended for certain parasite types?
Preserves oocysts of Cryptosporidium effectively
Which type of eggs are not suited for Brine's flotation method?
Trematode eggs
Why might some helminth eggs be missed using the zinc sulfate centrifugal flotation method?
'Density' issue of helminth eggs
What is the purpose of concentrating feces?
To decrease the amount of background material in the preparation
What should be done before proceeding to fecal concentration?
Direct examination
What is a key difference between concentrated preparations and direct microscopy?
Motile protozoan trophozoites are not found in concentrated preparations
Why do parasites settle at the bottom of the tube in the sedimentation method?
They have a higher specific gravity
Which concentration technique is the method of choice if the specimen is from an animal source?
Acid ether concentration technique
Why is HCl used in the acid ether concentration technique?
As a clearing agent
Learn about the purpose of concentrating feces to increase the chances of finding protozoan cysts, helminth eggs, and larvae. Understand the importance of direct examination before using concentration techniques and how they help detect more organisms compared to direct microscopy.
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