Sonographic assessment of post void residual urine volume in patients with lower urinary tract symptoms

Significant post void residual urine volume is commonly seen in patients with bladder outflow obstruction e.g. patients with enlarged prostate. accurate measurement of post void residual urine volume forms an important first line investigation and carries significant diagnostic value. this study was conducted to determine the accuracy of post void residual urine measurement in patients presenting to the urology outpatient department with lower urinary tract symptoms. ultrasound was done with full bladder and pre void bladder volume was noted. patients were then asked to empty their bladder and come back immediately for the second examination,when the post void urine volume was recorded. pmru measurements done in patients with bladders filled to maximum capacity resulted in false high estimations of pmru. for reliable measurements of pmru in patients with lower urinary tract symptoms it is recommended that pmru measurements be done on moderately filled urinary bladders.