The Measurement and Significance of the Urinary Flow Rate1

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Abstract
A simple, portable urinary flowmeter is described. In an attempt to assess its practical significance, the urinary flow rates of 200 male subjects were recorded. In the absence of symptomatic urethral obstruction the flow rate varies with the age of the subject and the voided volume; the latter should exceed 200 ml if the maximum rate is to be determined. The majority of patients with obstructive prostatic disease or urethral stricture will void with rates below 5 ml/sec, the range of normal being 15 to 45 ml per second.