Uroflowmetry is a noninvasive study for patients with suspected obstruction. Prolonged voiding time and decreased maximum (Qmax) and average flow rates (Qave) may indicate obstruction. The caveat is that uroflow interpretation cannot distinguish between obstruction with a high pressure detrusor contractility or impaired detrusor contractility as the cause of weak stream. After uroflowmetry, postvoid residual volume measurement is necessary. Presence of significant postvoid residual volume (>100mL) indicates either an impaired detrusor contraction or urinary outlet obstruction. In patients who have recently undergone surgical correction of SUI in absence of preop-erative voiding difficulties, large postvoid residual volume may be suggestive of urinary outlet obstruction. Otherwise, pressure-flow studies can differentiate between the causes of elevated postvoid volumes.

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