What is the purpose of performing a direct wet mount before staining in O&P?

• A. To fix slides for long-term storage
• B. To detect motile trophozoites and provide rapid assessment
• C. To quantify parasite load
• D. To identify bacteria

Answer: (B)

Direct wet mount lets you observe live, motile forms of intestinal protozoa, providing a rapid read on active infection. Because the organisms are still alive, you can see trophozoites moving in real time, which helps confirm their presence quickly and helps distinguish motile trophozoites from non-motile cysts or debris. This quick observation is valuable before staining, since staining fixes and kills the organisms and eliminates motility, making rapid assessment impossible after staining. Wet mounts aren’t used for long-term slide preservation or precise counting of parasite load, and they’re not the method of choice for identifying bacteria.