The normal urine flow rate of 20-30 ml/s applies to which groups?

• A. Males only
• B. Females only
• C. Both males and females
• D. Neither

Answer: (C)

Maximum flow rate during voiding, measured by uroflowmetry, reflects how strongly the bladder contracts and how much resistance the urethra offers. In healthy adults, this dynamic typically yields a normal maximum flow around 20–30 mL/s, and this range applies to both men and women. In men, conditions that obstruct the urinary outflow (like benign prostatic enlargement) can reduce flow below this range, while in women there is no prostate, but other factors such as pelvic floor function can influence the value. Because the same physiological process underlies micturition in both sexes, the 20–30 mL/s range is considered normal for adults regardless of gender. Values outside this range may prompt further evaluation to distinguish normal variation from potential issues with bladder emptying or obstruction.