What Your eGFR and Creatinine Numbers Mean for Black Adults

In adults, a normal eGFR is usually above 90. An eGFR that stays below 60 for three months or longer can mean chronic kidney disease, and below 15 is kidney failure. If you are Black and your kidneys were last checked before 2022, one more thing belongs in this picture: US labs changed the eGFR formula in 2021, so your current number may read lower than your old chart even though your kidneys have not changed. This guide explains all three kidney numbers, the stages, and exactly what to ask for at your next visit.

Serum creatinine is a waste product your body makes when muscle breaks down and when you digest protein. Healthy kidneys filter it out of your blood, so a rising level suggests your kidneys are filtering less. But creatinine is not a clean signal on its own. People with more muscle make more of it, a meat-heavy meal can raise it temporarily, and intense exercise, dehydration, and certain medicines and supplements can all push it up without any change in your kidneys. That is why labs do not stop at creatinine.

eGFR (estimated glomerular filtration rate) is a calculation, not a separate test. The lab plugs your creatinine, age, and sex into an equation that estimates how well your kidneys filter, reported in milliliters per minute. Since 2021, the standard is the CKD-EPI 2021 equation, which uses no race term.

uACR (urine albumin-creatinine ratio) measures protein leaking into your urine. A result of 30 mg/g or less is normal; above 30 can be a sign of kidney damage, and albumin can leak into urine while your eGFR is still normal. If you have diabetes or high blood pressure and no one has ever handed you a uACR result, ask for the test by name. It is a simple urine sample.

One reading does not make a diagnosis. Chronic kidney disease is defined by abnormal results that persist for more than three months, so a single low eGFR should be repeated, not mourned. The trend is the signal.

For over two decades, the standard US eGFR equations included a race coefficient: for the exact same creatinine, age, and sex, the lab reported a higher eGFR if the patient was identified as Black. Race is a social category, not a biological one, and when researchers validated the old equation against directly measured kidney function, it overestimated Black patients' true filtration rate by a median of 3.7 points.

A number that reads higher than reality is not a favor. It meant chronic kidney disease was diagnosed later, nephrology referrals came later, and Black patients reached the eGFR thresholds that start kidney transplant waiting time later than their kidneys actually warranted. In 2021, a joint task force of the National Kidney Foundation and the American Society of Nephrology recommended that every US lab immediately adopt a refit equation with no race variable. That race-free equation, CKD-EPI 2021, is the one labs use today.

The transplant system then went back to repair the damage. In June 2022, the Organ Procurement and Transplantation Network banned race-based eGFR calculations from its policies. In January 2023, it required every US kidney transplant program to find Black candidates whose waiting time had been delayed by the old equation and credit them the time they should have had. By the end of 2023, 14,419 Black candidates, 32 percent of Black kidney waiting-list registrations, had their waiting time corrected. Candidates who received that credit went on to receive deceased donor transplants at nearly three times the rate of those who did not. If you or a family member were evaluated for a kidney transplant before 2023, ask the transplant center directly whether your waiting time was reviewed under this policy, and read our guide to the kidney transplant access gap for Black patients.

The everyday consequence: if your eGFR was last calculated before 2021 or 2022, your next result may read a few points lower without any change in your kidneys. That is the corrected math doing its job. Do not panic at the drop, and do not dismiss it either. Treat the new number as your real baseline, repeat it, and pair it with a uACR.

eGFR is an estimate with real error bars. In the validation study for the current equation, at least 85 percent of estimates landed within 30 percent of directly measured kidney function, which means an individual eGFR of 60 can sit meaningfully above or below the true value. When the number does not fit the rest of your picture, ask about cystatin C, a second blood marker. The NKF-ASN task force and the KDIGO 2024 guideline both recommend combining creatinine with cystatin C to confirm an eGFR, because the combined equation is more accurate than either marker alone.

Diabetes and high blood pressure cause most kidney failure, and about 20 percent of non-Hispanic Black adults have chronic kidney disease. Most people who have it do not know, because early kidney disease usually has no symptoms. Get both numbers checked yearly if you live with diabetes; clinical guidance calls for a yearly urine albumin check. Ask how often you need both tests if you have high blood pressure, heart disease, or a family history of kidney failure. One more reason to be proactive: APOL1 gene variants, most common in people with West and Central African ancestry, raise kidney disease risk, and carrying two risk variants brings roughly a 15 to 20 percent lifetime chance of kidney disease. Read our full guide to APOL1 and kidney disease in Black adults.

Bring two questions to your next appointment: what is my eGFR, and what is my uACR? If the uACR has never been ordered, ask for it by name. If your eGFR history spans the 2021 change, ask your clinician to confirm your current result uses the race-free CKD-EPI 2021 equation and to reset your baseline from there. If your eGFR sits below 60 on two tests, ask what your stage is and whether a cystatin C confirmation or a nephrology referral makes sense. And if you want a clinician who takes both your labs and your lived context seriously, find a Black kidney specialist or primary care clinician in our directory.