Your primary care doctor is usually the first stop for kidney stones, but a urologist is the specialist who handles stones that won’t pass on their own or need surgical removal. Which doctor you need depends on the size of your stone, your symptoms, and whether you’ve had stones before.
Start With Your Primary Care Doctor
Most people first learn they have a kidney stone during a visit to their primary care doctor or an emergency room. For smaller stones, your primary care doctor can manage the entire episode without referring you to a specialist. Conservative management involves pain control (typically with anti-inflammatory medications, which work better and cause fewer side effects than opioids for kidney stone pain), follow-up imaging within 14 days to track the stone’s position, and a type of medication called an alpha blocker that relaxes the ureter to help the stone pass more easily. Alpha blockers are most helpful for stones in the lower ureter that measure between 5 and 10 millimeters.
Your doctor’s first job during an acute episode is ruling out anything that needs emergency care. Fever and chills suggest infection, which changes the situation entirely. Stones paired with a urinary tract infection raise the risk of serious kidney infection and require urgent intervention regardless of stone size. If you can’t keep fluids down due to vomiting, have blood in your urine, or your pain doesn’t respond to medication, those are reasons to head to the emergency department rather than wait for an office visit.
When You Need a Urologist
A urologist specializes in the urinary tract and is the doctor who performs surgery to remove kidney stones when necessary. Referral guidelines generally use 5 millimeters as the dividing line: stones smaller than 5 mm usually pass on their own and don’t need a specialist. Stones 5 mm or larger warrant a urology referral, especially if they’re blocking urine flow. If a smaller stone hasn’t passed within about four weeks, that’s also a reason to see a urologist for possible surgical removal.
Beyond size, several other situations call for urology involvement: stones that are unlikely to pass based on their location (higher up in the ureter or still in the kidney), stones causing obstruction that could damage the kidney, pain that’s difficult to control, or any sign of infection alongside a blocked stone. Near-total or total blockage of the ureter can start harming kidney function within two weeks, so these cases need prompt attention.
What a Urologist Does
Urologists offer three main procedures depending on stone size and location. Shock wave lithotripsy uses targeted energy waves from outside the body to break a stone into small fragments that you then pass naturally. It’s an outpatient procedure done under anesthesia. Ureteroscopy involves threading a thin, flexible scope up through the urethra and bladder into the ureter or kidney. Once the urologist finds the stone, they either remove it directly or break it apart with a laser. You typically go home the same day.
For larger stones, a procedure called percutaneous nephrolithotomy is used. The surgeon makes a small incision in your back and inserts a scope directly into the kidney to locate and remove the stone, sometimes using a laser to break it up first. This one requires a hospital stay of several days, so it’s reserved for stones too large for the other approaches.
When You Need a Nephrologist
A nephrologist is a kidney specialist, but their role with kidney stones is different from a urologist’s. Nephrologists focus on why you’re forming stones in the first place rather than removing them. Your urologist may recommend seeing a nephrologist if you have recurrent stones or are at high risk of forming more.
This matters because kidney stones come back frequently. Recurrence rates hit about 11% at two years, 20% at five years, and 31% at ten years. For people who’ve already had multiple stones, a nephrologist can run a metabolic workup to identify the underlying chemical imbalances driving stone formation. This evaluation includes blood tests checking calcium, uric acid, parathyroid hormone, and other markers, along with a 24-hour urine collection that measures levels of calcium, oxalate, citrate, sodium, uric acid, and other substances that promote or inhibit stone growth. The results guide a personalized prevention plan, which might involve dietary changes, increased fluid intake, or specific medications to correct whatever imbalance is found.
How Kidney Stones Are Diagnosed
Whichever doctor you see first will need imaging to confirm a stone and determine its size and location. A CT scan of the abdomen and pelvis (without contrast dye) is considered the gold standard, with roughly 95% sensitivity and 98% specificity for detecting stones. It’s the first-line recommendation from both the American Urological Association and American College of Radiology for adults with symptoms suggestive of a kidney stone.
Ultrasound is the preferred alternative for pregnant patients, children under 14, and younger adults, since it avoids radiation exposure. It’s also a reasonable first choice for thinner patients (BMI under 30) when there’s already a strong suspicion of stones. In emergency department settings, a randomized controlled trial found ultrasound and CT had equivalent diagnostic accuracy, which is why more clinicians are reaching for ultrasound first. Follow-up imaging after an initial diagnosis is often done with ultrasound as well, to track a stone’s progress without repeated radiation exposure.
Putting It Together
For a first-time, small kidney stone with manageable pain and no fever, your primary care doctor can handle everything. For stones 5 mm or larger, stones that won’t pass, or episodes complicated by infection or severe symptoms, a urologist is the specialist you need. And if stones keep coming back, a nephrologist can help figure out why and build a prevention strategy tailored to your specific body chemistry. In many cases, you’ll work with more than one of these doctors over the course of treatment and follow-up.