What is the purpose of a cough stress test during the initial physical examination for incontinence?

• A. To observe leakage when a sudden increase in intra-abdominal pressure is produced by coughing.
• B. To measure post-void residual.
• C. To image the urethra during coughing.
• D. To assess detrusor overactivity during filling.

Answer: (A)

The test is designed to reveal leakage caused by a sudden rise in intra-abdominal pressure, which occurs when you cough. If the pelvic floor or urethral sphincter isn’t providing enough closure, the increased pressure pushes urine past the urethra, indicating stress incontinence. This bedside observation directly tests the urethral closure mechanism under stress, helping distinguish stress-type leakage from urge or other incontinence causes.

Post-void residual measurement isn’t about reflex leakage with coughing; it assesses how much urine remains after voiding, not the mechanism of leakage under abdominal pressure. Imaging the urethra during coughing would require a different study and isn’t the purpose of the cough test, which is a simple clinical observation. Assessing detrusor overactivity during filling targets bladder contractions during filling (urgen/overactivity), typically via urodynamics, not a cough-induced leakage test.