[The study of urinary flow in 3 to 14 year-old children. Urinary flow rate nomograms]

A descriptive analysis of 1361 uroflowmetries carried out in healthy children of both sex aged 3 to 14 years is reported. Maximal flow rate (Qmax), average flow rate (Qave), flow time (tQ), and maximal flow time (tQmax) are expressed as a function of body surface (sc) and urinary output volume. It is found that tQ increases as the urinary output volume does and decreases as sc becomes greater, tQ values being higher in males. Qmax and Qave are higher in females and run parallel to sc and urine volume. Comparison between both sex shows significant differences in Qmax values. Study of urinary flow curves reveals a normal pattern in more than 90% of samples. A percentile nomogram is developed for Qmax and Qave as a function of urinary output volume, sex and body surface.