Hanging drop test is performed on the stool to measure the level of mobility of organism such as bacteria in the stool. Also known as Hanging Drop for Vibrio Cholerae Dark Illumination Stool test, it is performed to detect the Pseudomonas infection and to analyze the treatment of the infection. Motile and nonmotile organisms are present in the stool and based on the mobility of the cellular organism the result and further treatment is decided.