A urine flow test is a quick, simple test that gives useful feedback about the health of the lower urinary tract. It is often used to see if there is a blockage the normal urine outflow. Health conditions that can change normal urine flow to include:
Certain factors or conditions may interfere with the accuracy of a urine flow test. These factors include:
Straining with urination
Constipation
Your bladder is not full of urine
Body movement during urination
Certain medicines that affect bladder and sphincter muscle tone