All Products
Also known as
Uroflow test, urinary flow study, flow study, uroflow, urinary flow rate test, UFM
Definition
Uroflowmetry is a non-invasive diagnostic procedure used to measure the rate and flow of urine over time during micturition (urination).1 It quantifies the volume of urine voided from the body, the speed with which it is released, and how long the release takes to complete.2 The test provides objective measurements of urine flow parameters including maximum flow rate (Qmax), average flow rate (Qave), voided volume, and the pattern of urinary flow.3 Uroflowmetry is performed using an electronic uroflowmeter that records data when a patient urinates into a specialized funnel-shaped device or toilet.1 This simple diagnostic tool helps healthcare providers evaluate voiding dysfunction, such as the reduced flow rate and prolonged voiding time seen in benign prostatic hyperplasia, without requiring any invasive procedures, although it is a nonspecific test.2
Clinical Context
Uroflowmetry is primarily used in the evaluation of patients with lower urinary tract symptoms (LUTS), which may include difficulty urinating, weak urine stream, urinary frequency, urgency, or incontinence.1 It serves as a first-line diagnostic tool for assessing various urological conditions including:
1. Benign prostatic hyperplasia (BPH): In men with enlarged prostate glands that may obstruct the urethra and impede urine flow.1,2
2. Urethral stricture disease: When narrowing of the urethra occurs due to trauma, infection, or inflammation.1
3. Neurogenic bladder dysfunction: In patients with bladder issues resulting from nervous system injuries or disorders, such as spinal cord tumors or injuries.1
4. Bladder outlet obstruction (BOO): To evaluate the severity of blockage in the normal flow of urine.3
The procedure requires patients to arrive with a comfortably full bladder and urinate normally into the uroflowmetry device.1 For accurate results, patients should not strain or attempt to manipulate the flow rate during the test.1 Post-void residual urine volume is typically measured via ultrasound within 5 minutes following the uroflowmetry to provide a comprehensive assessment of bladder emptying.3 The test may need to be repeated on multiple occasions to increase reliability, as results can vary based on voided volume and the patient’s level of bladder fullness.3