A nephrologist, or kidney specialist, helps most with high blood pressure when it stays high despite several medicines, when blood or urine tests show kidney changes, or when a kidney-related cause is suspected. They look for the reason behind the numbers, choose treatment that also protects your kidneys, and work alongside your primary care clinician rather than replacing them.
Key Takeaways
- High blood pressure is the second leading cause of kidney failure in the United States, and kidney disease can push blood pressure higher.
- Blood pressure that stays high on three or more types of medicine, or high blood pressure with abnormal kidney tests, is a common reason for a referral.
- A kidney specialist may look for hidden causes such as a narrowed kidney artery, a hormone problem, sleep apnea, or medicines.
- Some blood pressure medicines, such as ACE inhibitors and ARBs, may also slow kidney disease, so the choice of medicine matters.
- A reading of 180/120 or higher with a headache, chest pounding, dizziness, or shortness of breath needs emergency care.
Why Do Kidney Specialists Treat High Blood Pressure?
Your kidneys and your blood pressure affect each other. High blood pressure can narrow and weaken blood vessels, including those in the kidneys, and damaged kidneys cannot remove all the wastes and extra fluid they should. That extra fluid can raise blood pressure further, which the National Institute of Diabetes and Digestive and Kidney Diseases (NIDDK) calls a dangerous cycle. High blood pressure is the second leading cause of kidney failure in the United States, after diabetes.
ANC lists both severe high blood pressure and kidney disease related to diabetes and high blood pressure among the conditions it treats. For the basics, such as accurate home readings and helpful daily habits, read How Blood Pressure Impacts Kidney Health.
When Is High Blood Pressure a Reason to See a Nephrologist?
Your primary care clinician may manage your blood pressure and check your kidney health, and may refer you to a kidney specialist when:
- Your blood pressure stays above goal even though you take at least three different types of blood pressure medicine, usually including a diuretic (water pill). This is called resistant hypertension.
- Kidney tests are abnormal, such as a GFR below 60 or a urine albumin-to-creatinine result of 30 mg/g or higher on repeat tests over 3 months.
- Kidney disease is complicated, getting worse quickly, or advanced.
- You have kidney disease and blood pressure that stays high on four or more medicines, which the international kidney guideline group KDIGO lists as a reason for specialist care.
- There are clues that a kidney-related problem is causing the high blood pressure.
If a lab report started the conversation, What Do Your Kidney Function Test Results Actually Mean? explains GFR, creatinine and urine albumin in plain terms.
What Kidney-Related Causes Can Raise Blood Pressure?
Sometimes high blood pressure has a specific cause that is treated differently. A kidney specialist may look into:
- Chronic kidney disease itself
- Renal artery stenosis, a narrowing of one or both arteries that carry blood to the kidneys
- Primary hyperaldosteronism, when the adrenal glands make too much of certain hormones
- Sleep apnea
- Medicines and products such as NSAID pain relievers, nasal decongestants, birth control pills, and licorice or other herbal products
NIDDK says renal artery stenosis is often overlooked. It suggests considering it when high blood pressure starts after age 50 or rises sharply, when there is no family history of high blood pressure, or when at least three types of medicine cannot control it. About 90 percent of cases come from atherosclerosis, the clogging and hardening of arteries.
What Does a Nephrologist Check for High Blood Pressure?
Expect questions first. A specialist will want to confirm that your readings are accurate, that you take your medicines every day, and that your numbers are not high mainly in the clinic, sometimes called white coat syndrome. You may be asked when it began, how you check it at home, and about every medicine and supplement you use.
Tests are chosen for your situation and may include:
- Blood tests for creatinine (used to estimate GFR), glucose, sodium and potassium
- A urine test for protein or albumin
- Blood tests that screen for adrenal or kidney causes, and sometimes a thyroid test
- Imaging such as a duplex (Doppler) ultrasound of the kidney arteries, or a CT or MR angiogram
- A sleep study if sleep apnea is suspected
How Do Nephrologists Treat Hard-to-Control Blood Pressure?
Treatment often starts with the simplest fix. Cleveland Clinic reports that in about 40 percent of resistant hypertension cases, medicines are not working because they are not being taken as prescribed, so your team may simplify your schedule or switch a medicine that causes side effects. Never stop a medicine on your own: talk to your doctor or pharmacist first.
When more is needed, kidney expertise shapes the choice. ACE inhibitors and ARBs lower blood pressure and may slow kidney disease (see how they act on the renin-angiotensin system), a diuretic is often added, and an aldosterone antagonist may be added depending on your potassium level. KDIGO advises checking blood pressure, creatinine and potassium within 2 to 4 weeks of starting or increasing an ACE inhibitor or ARB. A narrowed kidney artery may be treated with medicines, lifestyle changes and, for some people, a balloon and stent to open it.
How Do Kidney Specialists and Primary Care Share Blood Pressure Care?
Seeing a nephrologist usually adds a specialist to your team. NIDDK describes the primary care provider as the person you see for routine visits, who may monitor your kidney health, help manage high blood pressure, prescribe medicines and refer you to specialists. KDIGO also stresses team care that includes medication management, dietary counseling and education.
How the work is split varies, so ask early who adjusts your medicines, who orders your kidney labs, and where to send home readings. Keep one up-to-date medicine list, bring it to every visit, and use one pharmacy if you can so harmful combinations are caught.
When Should You Seek Care for High Blood Pressure?
Call 911 or go to the emergency room if your blood pressure suddenly reaches 180/120 or higher and you have a headache, pounding in your chest, dizziness, or shortness of breath. Cleveland Clinic calls this a hypertensive crisis that needs medical attention right away.
Make an appointment if your readings stay high even though you take every medicine as prescribed, if side effects make your medicines hard to take, or if a lab report shows a lower GFR or albumin in your urine. New swelling in your legs or ankles, or a change in how much you urinate, is also worth a call.
What Should You Ask a Nephrologist About Your Blood Pressure?
A few prepared questions help you get more from a short visit:
- Could a kidney artery or hormone problem be raising my blood pressure?
- What are my GFR and urine albumin results, and have they changed?
- Which of my medicines protect my kidneys, and could any medicine or supplement be raising my blood pressure?
- What blood pressure target is right for me?
- Who should I call about a high reading, you or my primary care clinician?
Consider bringing a family member or friend to take notes and help you remember what was said.
Frequently Asked Questions
Do I Need a Referral to See a Nephrologist for High Blood Pressure?
Usually. ANC notes that in most cases you need a referral from your primary care doctor to see a nephrologist, but it may depend on your insurance plan.
Will I Stop Seeing My Primary Care Doctor?
Usually not. Your primary care clinician remains your routine doctor while the nephrologist adds kidney-focused testing and treatment, so ask both how they will share your blood pressure plan.
What Blood Pressure Target Should I Aim for if I Have Kidney Disease?
There is no single number for everyone. Kidney guidelines encourage individual targets and a gentler approach for people who are frail, at high risk of falls, or dizzy when they stand, so ask your care team for yours.
Can Controlling Blood Pressure Slow Kidney Disease?
Yes. NIDDK calls blood pressure control the most important step you can take to treat kidney disease.
Should People With High Blood Pressure Get Kidney Tests?
Yes. High blood pressure is a risk factor for kidney disease, and KDIGO advises testing people at risk with both a GFR blood test and a urine albumin test.
Talk to ANC About High Blood Pressure and Your Kidneys
If your blood pressure is hard to control or your kidney tests have changed, ANC’s kidney specialists can help look for the cause and build a plan that protects your kidneys. Contact ANC or call 651-772-6251 to ask about an appointment.
Sources
- NIDDK: High Blood Pressure & Kidney Disease
- NIDDK: Renal Artery Stenosis
- Cleveland Clinic: Resistant Hypertension
- NIDDK: Managing Chronic Kidney Disease
- KDIGO: 2024 Clinical Practice Guideline for the Evaluation and Management of Chronic Kidney Disease
Medical Disclaimer
This article is for general educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment. Always consult a qualified healthcare provider with questions about your specific care and treatment options.
