8 Questions
Which fixative is commonly used for parasitic stages?
Formalin
Which fixative provides excellent preservation of protozoa?
Polyvinyl alcohol (PVA
What is the purpose of using stains in O&P testing?
To demonstrate the diagnostic features of cysts and trophozoites of parasites
Which stains are commonly used for routine O&P testing?
Trichrome and iron hematoxylin
Which fixative is good for various parasites?
Sodium acetate-acetic acid-formalin (SAF
What is the final procedure in the O&P examination?
Preparation and examination of a permanent stained smear
Which fixative can be used for both protozoa and helminths?
Alcohol
What type of collection systems are available for stool collection and fixation?
Single-vial collection systems
Study Notes
- Fixatives preserve the morphology of parasites in stool specimens.
- Formalin is an all-purpose fixative commonly used for parasitic stages.
- Sodium acetate-acetic acid-formalin (SAF) is a liquid fixative that is good for various parasites.
- Polyvinyl alcohol (PVA) is a plastic resin that provides excellent preservation of protozoa.
- Single-vial collection systems are available for stool collection and fixation.
- Alcohol can be used as a fixative for protozoa and helminths.
- Stains are used to demonstrate the diagnostic features of cysts and trophozoites of parasites.
- Two common permanent stains used for routine O&P testing are trichrome and iron hematoxylin along with Giemsa stain.
- Specialized stains are available for specific groups of parasites.
- The final procedure in the O&P examination is the preparation and examination of a permanent stained smear.
Are you a parasitology pro or just starting out? Test your knowledge of fixatives and stains used in the examination of stool specimens for parasites with this quiz. From formalin to SAF and PVA, learn which fixatives are best for preserving different types of parasites. Then, challenge yourself to identify the specialized stains used for specific groups of parasites and the final steps in the O&P examination process. Perfect for medical students, laboratory technicians, or anyone interested in the fascinating world of parasitology
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