PATHOLOGY

Detailed explanation-1: -Passing your urine happens when the brain tells the bladder muscle to tighten. This squeezes urine from the bladder. The brain then tells the sphincter muscles surrounding the urethra to relax. This lets the flow of urine go through the urethra and out of the body.

Detailed explanation-2: -A post-void residual measurement is a diagnostic tool used when there is a concern for underlying neurological disease/injury, bladder dysfunction, mechanical obstruction, infection or medication-induced urinary retention. Symptoms of urinary retention and post-void residual can be indirect.