Uroflow rate is the volume of urine flow through the urethra to be expelled from the body per unit time, calculated in ml/s. Uroflow rate is the simplest, non-invasive and non-invasive test in urodynamic examination, which objectively reflects the voiding process of the lower urinary tract; it reflects the function of the bladder, bladder neck, urethra and urethral sphincter during voiding and the relationship between them. It is used as a preliminary examination in patients with suspected urinary tract obstruction. The maximum urinary flow rate is the most important parameter in the determination of urinary flow rate. It is greater than 20 ml/s in men and 24 ml/s in women. generally more than 15 ml/s indicates normal bladder forceps function, less than 10 ml/s indicates subbladder obstruction, forceps dysfunction or too little total urine volume can also produce a lower than normal urine flow rate. It is generally accepted that a maximum urine flow rate of 25 ml/s or more can exclude the presence of lower urinary tract obstruction, those below 10 ml/s suggest obstruction, and those between 15-25 ml/s are suspected obstruction. The accuracy of urine flow rate measurement is poor if the volume of urine is less than 200 ml at a time, and it is best if it is between 200 and 400 ml. And there are differences depending on the age.