kidney stone ultrasound explained

Overview

A kidney stone ultrasound is a painless imaging test that uses sound waves to create pictures of your kidneys and urinary tract. It helps doctors see whether kidney stones are present and how large they are.

Yes, kidney stones are a common problem, and ultrasound is a very common first step in checking for them.

Kidney stones can affect anyone, but they are more common in adults between 30 and 50 years old, men more often than women, and those with a family history of stones.

Symptoms

Common symptoms

• Sharp pain in your side or back, below the ribs
• Pain that spreads to your lower belly or groin
• Pain that comes in waves and changes in intensity
• Painful urination
• Pink, red, or brown urine
• Cloudy or foul-smelling urine
• Feeling the need to urinate more often
• Nausea and vomiting

Symptoms in children

• Young children may not be able to describe pain well; look for fussiness or crying
• Blood in urine (pink or red)
• Unexplained stomach pain or vomiting

Symptoms in older adults

• Pain may be less intense or harder to locate
• More likely to have confusion or fever as a sign of infection
• Often have other health conditions that can mask symptoms

Causes

Main causes

• Not drinking enough water (dehydration)
• A diet high in salt, sugar, or animal protein
• Certain medical conditions like obesity, diabetes, or gout
• Family history of kidney stones

Risk factors

• Being between 30 and 50 years old
• Being male
• Previous kidney stones
• Certain medications and supplements (ask your doctor)
• Digestive diseases or surgeries that affect how your body absorbs nutrients

When to see a doctor

See a doctor urgently if:

• If you have severe pain that does not improve with rest
• If you have fever with pain
• If you cannot pass urine

Book a routine appointment if:

• If you have mild but ongoing discomfort in your side or back
• If you notice small amounts of blood in your urine
• If you have had a kidney stone before and want to check for new ones

Diagnosis

Doctors often start with an ultrasound to look for kidney stones. Ultrasound can show stones in the kidney or ureter (the tube from kidney to bladder). Sometimes a CT scan may be needed for a clearer picture.

Tests that may be done

• Kidney ultrasound (the main test)
• Urine test to check for infection or blood
• Blood test to check kidney function and look for stone-forming substances
• CT scan (if ultrasound is not clear enough)

What to expect at your appointment

For the ultrasound, you lie on a table. A technician applies a cool gel on your skin and moves a small device (transducer) over your back and sides. It is painless. You may be asked to hold your breath briefly. The test takes about 20–30 minutes, and you can go home right after.

Treatment

Treatment for kidney stones depends on the stone size, location, and your symptoms. Small stones often pass on their own with plenty of fluids. Larger stones may need medical help to break them up or remove them.

Self-care at home

• Drink plenty of water (aim for 2–3 liters per day unless your doctor advises otherwise)
• Over-the-counter pain relievers may help (ask your pharmacist or doctor which are safe for you)
• Wait for the stone to pass – it can take days to weeks

Medical treatments

If stones are too large to pass, doctors may use sound waves to break them up (shock wave lithotripsy), or insert a thin scope to remove or break the stone. Treatment is chosen based on the stone's size and location. Your doctor will explain the options that fit your situation.

When is surgery considered?

Surgery may be needed if the stone is very large, stuck, causing infection, or blocking urine flow. The most common surgery is a keyhole procedure called ureteroscopy or, rarely, open surgery.

Living with this condition

Most kidney stones pass on their own. While waiting, drink plenty of water and take pain relief as needed. Keep track of your symptoms and follow up with your doctor.

Lifestyle tips

• Drink enough water every day to keep your urine light yellow
• Reduce salt in your diet
• Limit foods high in oxalates (like spinach, nuts, chocolate) if you have calcium oxalate stones
• Avoid high-dose vitamin C supplements (check with your doctor)

Diet and exercise

A balanced diet with plenty of fruits and vegetables, and low in processed foods, can help. Gentle exercise is fine as long as you are not in severe pain. Staying active helps your overall health.

Mental health and emotional wellbeing

Dealing with kidney stones can be stressful and painful. It is normal to feel anxious. Talk to your healthcare team about your worries – they can offer support or refer you to a counselor if needed.

Prevention

Many kidney stones can be prevented by drinking enough water each day and making changes to your diet based on what type of stones you have. Your doctor can help you create a prevention plan.

Screening programmes

If you have had a kidney stone before, your doctor may recommend periodic check-ups or imaging to see if new stones are forming. At-home test strips for urine pH or blood may also be suggested, but always follow your doctor's advice.

Complications

If left untreated

• Blockage of urine flow, which can damage your kidney
• Kidney infection (pyelonephritis) – can be serious
• Recurring stones
• Long-term kidney damage if stones are large or repeatedly block urine

Long-term outlook

The outlook for kidney stones is very good. Most stones pass without lasting problems. With proper care and prevention, you can reduce your chance of having another one. Your doctor will help you manage your health and watch for any issues.

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