Normal Values:

Normal values vary depending on age and sex. In men, urine flow declines with age. Women have less change with age:

• Ages 4 - 7
  • The average flow rate for both males and females is 10 mL/sec.
• Ages 8 - 13
  • The average flow rate for males is 12 mL/sec.
  • The average flow rate for females is 15 mL/sec.
• Ages 14 - 45
  • The average flow rate for males is 21 mL/sec.
  • The average flow rate for females is 18 mL/sec.
• Ages 46 - 65
  • The average flow rate for males is 12 mL/sec.
  • The average flow rate for females is 18 mL/sec.
• Ages 66 - 80
  • The average flow rate for males is 9 mL/sec.
  • The average flow rate for females is 18 mL/sec.

What abnormal results mean:

Results are compared with your symptoms and physical exam. A result that may need treatment in one patient may not need treatment in another patient.

Several circular muscles normally regulate urine flow. If any of these muscles becomes weak or stops working, you may have an increase in urine flow or urinary incontinence.

If there is a bladder outlet obstruction or if the bladder muscle is weak, you may have a decrease in urine flow. The amount of urine that remains in your bladder after urinating can be measured with ultrasound.

Your health care provider should explain and discuss any abnormal results with you.