Maximum urinary flow rate (Qmax, peak flow)

Method

Peak urinary flow rate by uroflowmetry, on a void exceeding the study's stated minimum voided volume. The minimum voided volume is recorded on the edge, because flow rate is volume-dependent below roughly 150 mL.

The method is part of the endpoint identity. Studies measuring the same quantity by a different method are held as separate endpoints.

Notes

SIGN INVERSION against post-void residual volume. Both are urodynamic measures of the same bladder-outlet obstruction, taken at the same visit and reported in the same sentence, but this is a rate in mL/s improving by RISING while residual volume is a volume in mL improving by FALLING. Also distinct from the IPSS total score, which is subjective symptom report and dissociates from objective flow — an intervention can improve one and not the other — and from prostate volume, an anatomical measure that need not change for flow to improve.