Hanging Drop (Motility) is a microscopic microbiology test used to detect true bacterial motility in a fresh clinical specimen or bacterial suspension by observing live organisms under a microscope using the hanging drop method. This test helps differentiate motile and non-motile bacteria and is commonly used in routine microbiology for rapid preliminary identification of organisms such as Vibrio species (including suspected cholera), enteric bacilli, and other motile bacteria. It may also be used in stool or culture-based workups where darting or directional motility is clinically significant. The procedure involves placing a drop of fresh specimen or broth culture on a coverslip, inverting it over a cavity slide, and observing motility under the microscope. Hanging drop examination is especially useful as a rapid bedside or laboratory screening method, but results should always be correlated with Gram stain, culture, biochemical tests, and confirmatory microbiological identification.
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