Ultrasound of residual urine – Detection of bladder emptying problems
Post-void residual (PVR) ultrasound is used to assess the amount of urine remaining in the bladder after voiding. This is an important diagnostic tool for assessing bladder function and detecting bladder emptying problems.
Indications for residual urine measurement
1. Difficulty urinating
Evaluating problems such as difficulty urinating, weak urine stream, feeling of incomplete bladder emptying, or the need to urinate frequently.
2. Urinary incontinence
Identifying the cause of involuntary urine leakage.
3. Recurrent urinary tract infections
Evaluating urinary retention that may predispose to infection.
4. Assessing bladder function
In conditions such as neurogenic bladder, diabetic cystopathy, or benign prostatic hyperplasia.
Preparing for a residual urine ultrasound
Before the exam, you are usually advised to drink enough fluids to fill your bladder. You will be asked to urinate immediately before the exam so that the amount of urine remaining in your bladder can be measured.
Residual urine ultrasound procedure
The patient lies on their back on an examination table. A special gel is applied to the lower abdomen to help transmit sound waves. The doctor or technician moves an ultrasound probe over your lower abdomen to obtain images of your bladder. The probe is connected to a computer that displays the images in real time. Using the ultrasound images, the doctor measures the volume of urine remaining in your bladder. These measurements are usually expressed in milliliters (ml).
Interpretation of results
1. Normal: A small amount of residual urine is normal (usually less than 50 ml).
2. Increased residual urineA higher amount of residual urine may indicate problems with bladder emptying, such as urinary tract obstruction, bladder muscle weakness, or neurological problems.
After the residual urine ultrasound
You can return to your normal activities immediately after the ultrasound. Your doctor will analyze the results and inform you of the findings. If abnormalities are detected, your doctor will recommend further testing or treatment.
