What does a kidney doctor do?

A kidney doctor, also called a nephrologist, is a physician who specializes in kidney health. Nephrologists evaluate changes in kidney function, identify the cause of kidney problems, and work with your primary care provider and other specialists to help protect your kidneys. At The Liver Hope Foundation, we support both liver and kidney health because these organs can affect one another—especially for people living with liver disease, diabetes, high blood pressure, or transplant concerns.

Seeing a kidney specialist is not necessarily bad news. A referral can be a proactive step that helps catch concerns early, clarify your care plan, and add an expert to your healthcare team. The Liver Hope Foundation is not a medical provider; please talk with your healthcare provider about symptoms, test results, and whether a nephrology referral is right for you.

Frequently asked questions

Learn when a nephrologist may be involved in your care, what to expect from kidney specialty care, and how kidney health connects with liver health. These answers are for education and support and do not replace medical advice from your healthcare provider.

What is a kidney doctor called?

A kidney doctor is called a nephrologist. Nephrologists are physicians with additional training in diagnosing and managing kidney conditions, including chronic kidney disease, acute kidney injury, kidney failure, electrolyte concerns, and high blood pressure that affects the kidneys.

What does a nephrologist do?

A nephrologist reviews your health history, symptoms, medications, blood pressure, and kidney test results. They may order or interpret blood and urine tests, recommend imaging or additional evaluation, and create a care plan to help preserve kidney function. They also help manage complications such as swelling, anemia, mineral and electrolyte changes, and difficult-to-control blood pressure.

My kidney numbers are off. Do I need a specialist?

Changes such as a low estimated glomerular filtration rate (eGFR), rising creatinine, or protein in the urine can be reasons for your primary care provider to consider a nephrology referral. A single abnormal result does not always mean you have permanent kidney disease, but it deserves follow-up. Ask your provider what your results mean, whether they should be repeated, and whether a kidney specialist would help.

Are swelling, foamy urine, or blood in urine signs of a kidney problem?

They can be. Swelling in the feet, ankles, legs, hands, or around the eyes may have kidney-related or other causes. Foamy urine can sometimes occur when protein is present, and blood in the urine should be evaluated promptly. Contact your healthcare provider to discuss new or persistent symptoms. Seek urgent care for severe symptoms, heavy bleeding, trouble breathing, chest pain, confusion, or a major decrease in urination.

Should I see a nephrologist if I have diabetes or high blood pressure?

Diabetes and high blood pressure are common causes of kidney damage. Your healthcare provider may monitor kidney function and urine protein regularly and refer you to a nephrologist if results change, kidney disease progresses, blood pressure is difficult to control, or your care needs become more complex. Early attention can help slow further kidney damage.

How does kidney care connect to liver health?

Liver and kidney health are closely connected. People with liver disease may need nephrology care for kidney effects related to severe liver disease, including hepatorenal syndrome, medication-related kidney concerns, or evaluation for a combined liver-kidney transplant. Coordinated care between a hepatologist and nephrologist can help your team make informed decisions together.

What should I bring to a nephrology appointment?

Bring your recent lab results, a list of all prescription medicines, over-the-counter products, vitamins, and supplements, and notes about your symptoms and when they began. It can also help to bring blood pressure readings, details about your medical history, and questions you want answered. Ask whether any medicines, including NSAID pain relievers, may affect your kidneys before making changes on your own.

Can a nephrologist help with dialysis or transplant planning?

Yes. When kidney function becomes severely reduced, a nephrologist can explain treatment options such as hemodialysis, peritoneal dialysis, conservative kidney management, and kidney transplant evaluation. They work with you and other members of your care team to plan ahead and choose options that fit your health needs and goals.

Take the next informed step

If you have kidney-related symptoms or abnormal lab results, ask your primary care provider whether a referral to a nephrologist is appropriate. Bring your recent lab results and a clear list of your symptoms to the conversation. Explore The Liver Hope Foundation’s free kidney health guides for practical education and support—you do not have to figure this out alone.