Bladder scan

Overview

A bladder scan is a painless, non-invasive test that uses ultrasound waves to check how much urine is left in your bladder after you have urinated. It helps doctors see if you are emptying your bladder completely, which can be a sign of certain health issues.

Yes, bladder scans are a routine part of urology diagnostics. They are used in hospitals, GP surgeries, and some outpatient clinics whenever there are concerns about bladder function.

Bladder scans can be needed by anyone—men, women, and children—but are especially common in older adults, people with prostate problems, nerve conditions, or after certain surgeries.

Symptoms

Common symptoms

• Difficulty starting to urinate or weak urine stream
• Feeling like your bladder is not empty after you go to the toilet
• Needing to urinate often, including waking up many times at night
• Sudden, strong urges to urinate that are hard to control
• Dribbling of urine after you think you have finished

Symptoms in children

• Wetting the bed after being toilet-trained for more than 6 months
• Daytime accidents or having to rush to the bathroom
• Straining when urinating or passing urine very infrequently

Symptoms in older adults

• Increased frequency of urination, especially at night
• Weak or interrupted urine stream
• Feeling of incomplete emptying even after repeated visits to the toilet

Causes

Main causes

• Prostate enlargement in men (benign prostatic hyperplasia)
• Nerve problems that affect bladder signals (such as from diabetes, stroke, or spinal injury)
• Bladder outlet obstruction (blockage from a tumor, scar tissue, or a stone)
• Weak bladder muscles that cannot contract fully (common in older age)
• Side effects from medications like anticholinergics or some cold remedies

Risk factors

• Being over 50, especially for men with prostate issues
• Having diabetes, multiple sclerosis, or Parkinson’s disease
• Using medicines that relax the bladder or slow down urine flow
• After pelvic surgery or childbirth (for women)
• Long-term constipation, which can press on the bladder

When to see a doctor

See a doctor urgently if:

• You cannot urinate at all and your lower belly is hard and painful
• You have blood visible in your urine along with pain or fever
• You have sudden, severe pain in your sides or back

Book a routine appointment if:

• You often feel like your bladder is not empty after going to the toilet
• You wake up to urinate more than twice every night
• You have trouble starting to urinate or have a weak stream

Diagnosis

The bladder scan itself is the diagnostic test. A health professional uses a handheld ultrasound device on your lower abdomen while you lie down. The scan measures the amount of urine in your bladder before and after you empty it.

Tests that may be done

• Bladder scan (ultrasound) – the main test to measure post-void residual urine
• Urine test (urinalysis) to check for infection or blood
• Uroflowmetry – a test that measures how fast your urine flows
• Further scans (e.g., CT or MRI) if the doctor suspects a structural problem

What to expect at your appointment

You will be asked to urinate into a toilet or container. Then you lie back on a bed, and the doctor or nurse places a small gel-covered probe on your lower belly. It feels like a mild pressure. The scan takes only a few seconds and is completely painless.

Treatment

Treatment depends on the cause of your bladder not emptying fully. It may include lifestyle changes, medications to improve bladder function, or, in some cases, surgery to remove an obstruction.

Self-care at home

• Make sure you drink enough water (6-8 glasses per day) to avoid concentrated urine
• Try double voiding – wait a minute after you finish and then try to go again
• Do pelvic floor muscle exercises to strengthen the muscles that control urination
• Avoid caffeine, alcohol, and spicy foods if they seem to make symptoms worse

Medical treatments

Your doctor may suggest medications that help relax the prostate or bladder muscles, or that improve nerve signals to the bladder. In some cases, a temporary catheter (a thin tube) may be used to drain urine until the underlying problem is treated.

When is surgery considered?

If an enlarged prostate, tumor, or stricture (narrowing) is causing a blockage, surgery may be recommended to remove the obstruction and allow normal urine flow.

Living with this condition

Most people with bladder emptying problems can manage well with simple routines. Plan toilet trips to avoid feeling rushed, and keep a diary of your symptoms to share with your doctor.

Lifestyle tips

• Stay active – gentle exercise like walking can help digestion and bladder health
• Maintain a healthy weight to reduce pressure on your bladder
• Wear clothes that are easy to remove when you need to use the toilet

Diet and exercise

Eating plenty of fibre (whole grains, fruits, vegetables) helps prevent constipation, which can worsen bladder symptoms. Avoid heavy lifting or straining during exercise, as this can put pressure on your pelvic floor.

Mental health and emotional wellbeing

It is normal to feel embarrassed or worried about bladder symptoms, but they are very common and often treatable. Anxiety can actually make symptoms worse. Talking to a doctor or counsellor can help you feel more in control.

Prevention

You cannot always prevent the conditions that lead to a bladder scan, but maintaining a healthy lifestyle can reduce your risk of prostate problems, diabetes, and constipation that can affect bladder function. Staying active and well-hydrated is beneficial.

Complications

If left untreated

• Urinary tract infections (UTIs) from stagnant urine
• Bladder stones that form when urine sits too long
• Kidney damage or failure from long-term backflow of urine
• Overflow incontinence – leaking urine when your bladder is too full

Long-term outlook

With proper diagnosis and management, most bladder emptying problems can be greatly improved. Many people return to normal or near-normal function. The key is to see your doctor early and follow the treatment plan.

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