High-Resolution Anal Manometry evaluates anal sphincter function. It is done to evaluate incontinence and other disorders of defecation, including some forms of constipation. This procedure tests if there are appropriate pushing and relaxation to facilitate defecation and assesses various reflexes that control the sphincter. When done with a balloon expulsion test it can further evaluate the effectiveness of evacuation.
The procedure is performed while the patient is awake and requires patient cooperation with various instructions to test the strength of the anal sphincter by squeezing or simulating defecation. 3-D high-resolution probes can tell if a portion of the sphincter is not working or if it is not working in general.