Urodiagrams: a new method of uroflow pattern analysis.

Uroflow diagrams, obtained by plotting the mean flow rate at 1-second intervals for controls and patients with bladder outflow obstruction, have been studied in 60 healthy controls and 100 patients. Standard patterns were obtained for male and female controls in 3 different age groups and for patients with various types of lower urinary tract obstruction. Outflow diagrams in age and sex-matched controls were compared to those obtained from patients, indicating the nature and the site of obstruction.