When a kidney problem needs a nephrologist

Why you will not feel it

Chronic kidney disease rarely causes symptoms until a large part of kidney function is already gone. There is no pain. Swelling, tiredness, poor appetite and itching all arrive late.

That is why it is found on tests rather than by how you feel, and why around nine in ten people with early kidney disease do not know they have it.

Two numbers do most of the work. eGFR estimates how well the kidneys filter, and urine albumin to creatinine ratio shows protein leaking into the urine. You want both, because either can be abnormal on its own, and the urine test is the one most often skipped.

The numbers that mean a referral

Kidney guidelines point toward a specialist when:

• eGFR is below 30
• Urine albumin to creatinine ratio is 300 mg/g or higher
• eGFR is falling quickly, rather than drifting slowly with age
• There is blood in the urine not explained by infection or stones
• Blood pressure will not come down despite three or more medicines
• There are repeated kidney stones, or a family history of kidney disease such as polycystic kidney disease
• Potassium or another electrolyte keeps going out of range
• The cause of the kidney disease is simply not clear

An eGFR of 45 that has been stable for five years with no protein in the urine is usually managed perfectly well in primary care.

What a nephrologist actually changes

Two things, mainly. They work out the cause, which changes the treatment, and they slow the decline.

The medicines that protect kidneys have changed enormously in a short time. ACE inhibitors and ARBs have been used for decades. SGLT2 inhibitors now slow kidney disease progression in people with and without diabetes, and reduce heart failure admissions at the same time. Finerenone adds further protection in diabetic kidney disease. GLP-1 medicines have shown kidney benefit too.

A clinician who is not offering these is working from an out-of-date playbook. That is worth saying out loud at an appointment.

Late referral is strongly associated with worse outcomes, including starting dialysis as an emergency through a neck line rather than in a planned way through a properly prepared access.

What to expect at the visit

Bring every past creatinine result you can get hold of. The trend across years matters more than any single value, and it is the first thing a nephrologist will look for.

Expect urine tests, blood tests, usually a kidney ultrasound, a careful review of every medicine including over-the-counter anti-inflammatories and any supplements, and a conversation about blood pressure targets and dietary salt.

If function is significantly reduced, expect a discussion about what happens later. Good nephrology talks about transplant and dialysis options early, when there is time to prepare, rather than in a crisis.

What protects kidneys

• Blood pressure control, which matters more than almost anything else
• Blood sugar control if you have diabetes
• An SGLT2 inhibitor where indicated, now recommended for a wide range of people with chronic kidney disease
• Less salt, which makes the blood pressure medicines work better
• Avoiding regular NSAIDs such as ibuprofen and naproxen
• Caution with contrast scans, though this risk is smaller than once believed and should not stop a necessary scan
• Stopping smoking, which accelerates kidney decline as well as everything else

Notice what is absent: there is no supplement that protects kidneys, and several, including high-dose vitamin C and some herbal preparations, actively harm them.

Finding a kidney specialist

Every clinician in our nephrologists list has had their license checked against the national registry, has their board certifications recorded, and has been screened against their public record. We show no patient reviews and no star ratings, and paying for a listing never changes who passes review.