It is a measure of the quantity of urine excreted in a specified period of time (per second or per minute).
A lower Qmax may indicate that the enlarged prostate puts pressure on the urethra, partially occluding it.
[1] Changes in the urine flow rate can be indicative of kidney, prostate or other renal disorders.
Similarly, by measuring urine flow rate, it is possible to calculate the clearance of metabolites that are used as clinical markers for disease.
The urinary flow rate in males with benign prostate hyperplasia is influenced, although not statistically by voiding position.