“…Symptoms and postvoiding residual volume (PVR) correlate poorly with BOO, 6,7 and despite its widespread use, 8 urine flow rate has unclear diagnostic accuracy and utility for BOO 9 . Investigators have found that flow rate does 7 and does not correlate 6,10–13 with urodynamically defined BOO; predicts 14–17 and fails to predict 18,19 outcome from transurethral prostatectomy; and should 8,16,20–22 and should not be used 12,23 as a screening test for BOO. Methodological differences between studies regarding subject selection, definitions for BOO, and correction of flow rate for voided volume compound the confusion further.…”