Uroflowmetry measures the flow of urine. It tracks how fast urine flows, how much flows out, and how long it takes. It’s a diagnostic test to assess how well the urinary tract functions. Doctor may suggest uroflowmetry if you have trouble urinating, or have a slow stream. By measuring the average and top rates of urine flow, this test can show an obstruction in urinary tract such as an enlarged prostate. When combined with the cystometrogram (CMG) it can help find problems like a weak bladder. The flow rate is calculated as milliliters (ml) of urine passed per second. Both average and top flow rates are measured. The fastest flow rate, also known as Qmax, is used to understand if a block or obstruction is severe.