The Stool Hanging Drop test is a microscopic examination technique used to observe live, motile organisms in a fresh stool sample. A drop of stool is suspended on a slide and examined under a microscope to identify actively moving parasites or bacteria.
This method is particularly useful for detecting motile trophozoites such as Entamoeba histolytica and Giardia lamblia, which may not be easily identified in routine stained preparations.
Since the organisms are observed in their active state, the sample must be examined immediately after collection for accurate results. This test is often used alongside routine stool examination for comprehensive diagnosis of intestinal infections.