Flow rate · Uroflowmetry
How quickly does urine flow?
You pass urine into special equipment that records the volume, speed and pattern of your flow. The test is non-invasive and is often followed by a bladder scan.
Follow your appointment instructions and aim for a comfortably full bladder. Tell staff if holding on is difficult; do not force yourself to become painfully full.
Flow test & scan · NHS PDF ↗
The Princess Alexandra Hospital NHS Trust · Source page
Flow testing at Birmingham Advanced Urology →
Bladder scan · PVR
How well does the bladder empty?
A small ultrasound scanner is placed over your lower tummy after you pass urine. It estimates the amount left behind, called the post-void residual (PVR).
The scan is usually painless. The result is considered alongside your symptoms and other tests; one measurement alone does not identify why urine remains. Sometimes it needs repeating.
Read the NHS scan guide ↗
Gloucestershire Hospitals NHS Foundation Trust · Web guide
Printable flow and residual-scan information (NHS PDF) ↗
Specialist pressure testing
Urodynamics
Urodynamics measures pressures while the bladder fills and empties. Fine tubes are used to help your specialist understand bladder function and guide treatment.
Your team will explain preparation, medicines and urine checks. Contact them before the test if you think you have a urine infection. Temporary discomfort, bleeding or infection can occur; your team will discuss the risks with you.
Urodynamics · NHS PDF ↗
Gloucestershire Hospitals NHS Foundation Trust · Source page
Our urodynamics information →