KUB (Kidneys, Ureters and Bladder) Ultrasound
A KUB ultrasound is a focused abdominal scan that assesses the kidneys, ureters and bladder. It provides clear imaging to detect kidney stones, cysts, blockages, urinary retention, infections and other causes of abdominal, flank or urinary symptoms. This non-invasive, radiation-free scan is commonly used as a first-line investigation for urinary tract concerns and ongoing kidney or bladder monitoring.
What is a KUB (Kidneys, Ureters and Bladder) ultrasound?
A KUB ultrasound uses high-frequency sound waves to examine:
- Kidneys – size, shape, cysts, stones, inflammation, hydronephrosis
- Ureters – dilation or obstruction (visualised indirectly)
- Bladder – wall thickness, stones, diverticula, abnormalities
- Post-void residual volume – to check how well the bladder empties
- Surrounding tissues – signs of infection, swelling or fluid collections
It is particularly useful for investigating urinary symptoms, kidney pain, recurrent infections and suspected stones.
Why consider a private KUB scan?
You may benefit from this scan if you have:
- Suspected kidney stones or urinary obstruction
- Flank pain or lower abdominal pain
- Recurrent urinary tract infections (UTIs)
- Blood in urine (visible or microscopic)
- Difficulty passing urine or weak flow
- History of hydronephrosis or urinary tract abnormalities
Advantages of private ultrasound:
- Safe and radiation-free
- More accurate than external scan for fine detail
- No referral required
- Consultant sonographer report provided
- Ideal for fertility and menstrual health assessment
Symptoms or concerns that may require this scan
Consider this scan if you are experiencing:
- Flank, back or abdominal pain
- Difficulty urinating or weak urine flow
- Increased frequency or urgency of urination
- Blood in urine (haematuria)
- Recurrent UTIs
- Persistent kidney or bladder-related symptoms
- Concerns about urinary retention or incomplete emptying
What can this ultrasound detect?
- Kidney stones or obstruction
- Hydronephrosis (swelling of kidneys due to blockage)
- Kidney cysts or masses
- Bladder stones or wall thickening
- Post-void residual urine volume
- Ureteral dilation (suggestive of blockage)
- Renal scarring or chronic disease indicators
Preparing for your KUB scan
Preparation instructions:
- Drink 4–6 glasses of water before the scan to ensure a full bladder
- Avoid emptying your bladder until after the initial imaging
- No fasting required
- The scan is external and painless
- Scan time: ~ 30 minutes
Inform the team if:
- You are experiencing severe pain or fever (urgent symptoms)
- You have a history of kidney stones or urinary surgery
- You struggle to maintain a full bladder
- You are currently being treated for a UTI
How it works
Smarter Scanning. Proactive Health. Peace of Mind.
Choose
Pick a scan or a program. No referral required.
Book
Select a time online - same‑day availability.
Scan
Be seen by specialists in our Bluewater clinic.
Results
Consultant‑led report within 3 working days, accessible online.
Get clarity. Get control.
Cut out long NHS queues, avoid opaque private quotes, and step into a single-visit, consultant-led experience.
