At RAD Clinics, we know that sudden side pain, blood in the urine, or repeated urinary symptoms can feel worrying. Many people come to us asking the same question: Can ultrasound detect kidney stones?
The answer is yes, ultrasound can detect many kidney stones, especially stones sitting inside the kidney. It can also show signs that urine is not draining properly, such as swelling of the kidney, which is called hydronephrosis.
Ultrasound is a safe, non-invasive scan that does not use radiation. That makes it a helpful first step for many people with suspected kidney stones. However, it does have limits. Very small stones, or stones hidden in certain parts of the ureter, the tube between the kidney and bladder, may not always be seen clearly.
Who Is This Guide For?
This guide is for adults who may be dealing with kidney pain, flank pain, urinary symptoms, or possible kidney stone symptoms.
You may find it useful if you have:
- Pain in your side, back, or lower abdomen
- Pain that travels towards the groin
- Blood in your urine
- Nausea or vomiting with pain
- Repeated urinary infections or urinary symptoms
- A previous history of kidney stones
- Been advised to consider a renal or urinary tract ultrasound
What Are Kidney Stones and How Do They Form?
Kidney stones, also called renal calculi, are hard deposits that form from minerals and salts in the urine. They can develop when the urine becomes too concentrated,d and certain substances start to crystallise.
Some stones stay inside the kidney and cause little or no pain. Others move into the ureter, where they can block urine flow and cause intense pain.
Common types of kidney stones include:
- Calcium oxalate stones
- Calcium phosphate stones
- Uric acid stones
- Struvite stones
- Cystine stones
Calcium-based stones are the most common. Some people only have one stone in their lifetime, while others may have repeated episodes.
What Does Kidney Stone Pain Feel Like?
Kidney stone pain can feel different from person to person. For some, it starts as a dull ache. For others, it can come on suddenly and feel very severe.
Typical symptoms may include:
- Sharp pain in the side or back
- Pain that comes in waves
- Pain moving towards the groin
- Blood in the urine
- Feeling sick or vomiting
- Needing to pass urine more often
- Burning or discomfort when passing urine
The pain is often worse when a stone is blocking the normal flow of urine.
If your symptoms are severe, getting worse quickly, or linked with fever, shivering, vomiting, weakness, or difficulty passing urine, please seek urgent medical advice.
Can Ultrasound Detect Kidney Stones?
Yes, ultrasound can detect many kidney stones. It is especially helpful for stones inside the kidney and for checking whether the kidney looks swollen because urine is not draining properly.
During a kidney ultrasound, stones may appear as bright areas on the scan. Sometimes, they create a shadow behind them because the sound waves cannot pass through the stone easily.
A renal ultrasound may show:
- Kidney stones
- Swelling of the kidney
- Signs of blocked urine flow
- Bladder changes
- Other urinary tract concerns
At RAD Clinics, our team looks carefully at the kidneys and related urinary tract structures. We also provide a formal report, which can help you and your healthcare professional decide what should happen next.
How Accurate Is Ultrasound for Kidney Stones?
Ultrasound is useful, but it is not perfect.
It is generally better at seeing larger stones and stones inside the kidney. It may be less reliable for very small stones or stones sitting in the middle part of the ureter. Things like bowel gas, body shape, stone position, and how full the bladder is can also affect how clearly we can see the area.
This is why ultrasound findings should always be understood together with your symptoms, examination, urine results, blood tests, and clinical history.
Can Ultrasound Miss Small Kidney Stones?
Yes. Small kidney stones can sometimes be missed on ultrasound, especially if they are only a few millimetres in size.
A scan may also show swelling of the kidney without clearly showing the stone causing it. In that situation, your doctor may recommend further tests, depending on your symptoms and overall picture.
Can Ultrasound Detect a Kidney Stone in the Ureter?
Sometimes. Stones near the kidney or close to the bladder may be visible on ultrasound. Stones in the middle section of the ureter can be harder to see because bowel gas and surrounding tissues may block the view.
Even when the stone itself is not clearly seen, ultrasound may still show hydronephrosis. This can be an indirect sign that urine is not draining normally.
How Does Ultrasound Compare With CT Scan and KUB X-ray for Kidney Stones?
Ultrasound, CT scan, and KUB X-ray can all be used in kidney stone care, but they are not the same. The best test depends on your symptoms, previous stone history, pregnancy status, age, and whether urgent complications are suspected.
| Imaging test | Main benefits | Main limits |
|---|---|---|
| Ultrasound | No radiation, quick, non-invasive, useful for kidney swelling and many kidney stones. | Can miss small stones or some ureter stones. |
| CT scan | Most accurate test for stone size and location. | Uses ionising radiation. |
| KUB X-ray | Can help monitor some known stones. | Misses many stones and gives limited soft tissue detail. |
A CT scan is usually more accurate than ultrasound for finding kidney stones, especially stones in the ureter. It may be recommended if symptoms strongly suggest a stone, but ultrasound does not give a clear answer, or if exact stone size and location are needed.
Ultrasound is still very valuable because it avoids radiation and can give useful information quickly, especially for first checks and follow-up in some patients.
When Is a CT Scan Preferred Over Ultrasound for Kidney Stones?
A CT scan may be preferred when symptoms strongly suggest a stone but ultrasound is inconclusive, when precise stone size and location are needed, when treatment or surgical planning is being considered, or when complications are suspected.
Your healthcare professional will usually decide whether CT is needed based on your symptoms, examination findings and any previous stone history.
What Is a KUB X-ray?
KUB stands for kidney, ureter, and bladder. A KUB X-ray is a plain X-ray of this area.
It may be used to monitor some known stones, particularly stones that show up well on X-ray. However, it is usually less useful than CT for a first diagnosis and does not show soft tissues as clearly as other types of imaging.
Which Scan Is Best for Someone Who Has Had Repeated Kidney Stones?
For people who have had repeated kidney stones, ultrasound is often helpful for follow-up because it avoids repeated radiation exposure. CT may still be needed if symptoms change, if the ultrasound is unclear, or if a more detailed assessment is required.
This balance matters because the safest and most useful scan can depend on the individual situation.
What Else Can a Kidney Ultrasound Scan Detect?
A kidney ultrasound can look for more than kidney stones. It can also help assess the kidneys, bladder, and parts of the urinary tract.
A scan may help identify:
- Hydronephrosis, meaning swelling of the kidney
- Kidney cysts
- Kidney masses
- Urinary tract obstruction
- Bladder abnormalities
- Urine left in the bladder after passing urine
- Structural kidney changes
- Some complications linked with urinary tract infections
Simple kidney cysts are common and are often harmless. If a cyst looks more complex, or if a suspicious area is seen, further imaging such as CT or MRI may be recommended.
Can a Kidney Scan Detect a Blockage or Swelling of the Kidney?
Yes. Ultrasound is particularly helpful for detecting hydronephrosis, which means the kidney is swollen because urine is not draining as expected.
Hydronephrosis does not always prove that a stone is present, but it is an important finding. It can help your doctor decide whether you need further tests or urgent assessment.
Can a Kidney Ultrasound Detect a Cyst or Tumour?
Yes, ultrasound can often identify simple kidney cysts and may also detect masses or unusual areas in the kidney.
Ultrasound cannot always fully characterise every abnormality. If something needs a closer look, your healthcare professional may recommend CT, MRI or specialist review.
How Much Does a Private Kidney Scan Cost - and What Is Included?
A private renal and urinary tract ultrasound scan at RAD Clinics includes both the ultrasound examination and a detailed diagnostic report. For our latest fees and pricing information, please visit our website.
Please note that our fees may change over time, so we always recommend checking the latest price with our team before booking.
A private kidney scan may be helpful if you want a prompt check for kidney pain, urinary symptoms, suspected kidney stones, or follow-up of a known urinary tract concern.
At RAD Clinics, patients can self-refer for renal and urinary tract ultrasound scans. This means you do not always need a GP referral to arrange an appointment.
What Happens at a Renal Ultrasound Appointment at RAD Clinics?
We aim to keep the appointment calm, clear, and straightforward.
Your appointment may include:
- A brief review of your symptoms and relevant history
- Ultrasound assessment of both kidneys
- Assessment of the bladder and urinary tract where appropriate
- Clear explanation of what happens during the scan
- A formal imaging report
- Guidance on any recommended next steps
For some urinary tract scans, you may be asked to attend with a comfortably full bladder. Preparation can vary depending on the scan booked, so please follow the instructions given when you arrange your appointment.
Where Can I Find a Private Kidney Stone Scan Near Me?
RAD Clinics provides private renal ultrasound scans for patients who want prompt assessment of kidney pain, urinary symptoms, or suspected kidney stones.
Appointments may be available at:
- Northampton
- Milton Keynes
- St Neots
Our team can help you choose the most suitable scan and explain what ultrasound can and cannot assess.
Key Takeaways
- Ultrasound can detect many kidney stones, especially stones inside the kidney.
- It is useful for checking whether the kidney is swollen because urine is not draining properly.
- Small kidney stones and some ureteric stones may be missed.
- CT remains the most accurate test when exact stone size and location are needed.
- Ultrasound avoids radiation and may be useful for initial assessment or follow-up.
- Renal ultrasound can also detect cysts, masses, obstruction and bladder-related concerns.
- At RAD Clinics, patients can self-refer for private renal and urinary tract ultrasound scans.
Conclusion
If you are asking can ultrasound detect kidney stones, the honest answer is: often yes, but not always. Ultrasound is safe, non-invasive and helpful for many people with kidney pain or urinary symptoms, especially when the aim is to check the kidneys and look for swelling caused by possible blockage.
At RAD Clinics, we can help with a private renal ultrasound scan, a calm appointment experience and a detailed report to support the next step in your care. Please speak with your GP, consultant or healthcare professional for advice about your individual symptoms.
Common questions about Kidney Stone Ultrasound Scans
Can ultrasound miss small kidney stones?
Yes, a kidney ultrasound scan can miss very small kidney stones, particularly those located in the ureters or stones measuring only a few millimetres. Ultrasound remains effective for detecting larger stones and identifying secondary signs such as kidney swelling.
Is ultrasound better than CT for kidney stones?
A CT scan identifies kidney stones more accurately than ultrasound and detects smaller stones throughout the urinary tract. A kidney ultrasound scan remains a valuable first-line test because it avoids radiation exposure and provides rapid assessment of the kidneys and bladder.
Can ultrasound detect ureter stones?
A urinary tract ultrasound detects some ureter stones, particularly when they cause blockage and swelling of the kidney. Ultrasound also identifies signs of urinary obstruction, which helps clinicians assess the impact of a suspected ureter stone.
Do I need a GP referral for a private kidney scan?
No, you do not need a GP referral for a private kidney ultrasound scan at RAD Clinics. Patients can book directly with our team, allowing faster access to diagnostic imaging and clinical assessment.
How much does a kidney ultrasound cost?
The cost of a private kidney ultrasound scan varies depending on the clinic, location, and whether additional imaging is required. At RAD Clinics, current pricing is available on our fee guide, with transparent costs and no lengthy waiting lists.
References
