Objective To determine whether it is possible to predict correlation for the IPSS and the quality-of-life question of the IPSS. The percentage of patients with BOO the presence of bladder outlet obstruction (BOO) by non-invasive clinical variables in patients with lower defined by a linPURR of 3-6 decreased from 85% in those with a Q max of 0-5 mL/s to 60% (Q max urinary tract symptoms (LUTS) suggestive of BOO. Patients and methods Patients with LUTS suggestive of 6-10 mL/s) and 44% (Q max 11-15 mL/s). In parallel, the percentage of patients with BOO increased from BOO were entered into a prospective protocol evaluating the International Prostate Symptom Score (IPSS), 53% of those with a prostate volume of ∏50 mL, to 79% of those with prostates of 51-100 mL and 75% prostate size, non-invasive uroflow, post-void residual urine volume (PVR) and a pressure flow study. Only of those >100 mL. Based on Q max , PVR and prostate volume, nomograms were established by multiple patients with a maximum flow rate (Q max ) of∏15 mL/s and an IPSSÁ7 were included. The study comprised logistic regression analysis for the probability of BOO in patients with LUTS. 253 patients; the degree of obstruction was correlated to several non-invasive clinical variables.Conclusion The nomograms presented herein should help the clinician to identify patients with LUTS who Subsequently nomograms were developed by multiple logistic regression analysis to obtain the probability of should undergo pressure flow studies before surgical intervention to detect the presence of obstruction and BOO in patients with LUTS.