A mildly decreased GFR means your kidneys are filtering somewhat less blood than a young adult’s would, but still enough to do their job well. The number alone does not mean you have kidney disease. Doctors need a second sign of kidney damage before using that label.1National Kidney Foundation. Stage G2 Chronic Kidney Disease (CKD) Plenty of people in this range simply have older kidneys, a temporary dip, or a body type that skews the estimate, which is why one reading is a starting point rather than a verdict.
What the 60 to 89 Range on Your Report Means
Your lab report may list “eGFR,” short for estimated glomerular filtration rate. It estimates how many millilitres of blood your kidneys clean each minute, worked out from a waste product in your blood called creatinine, which your report may also list, plus your age and sex. A value of 90 or above is considered normal, and 60 to 89 is labelled mildly decreased.2American Kidney Fund. Stage 2 chronic kidney disease (CKD) causes, symptoms, and treatment Below 60 for three months or more counts as kidney disease even without other findings.
Portals often flag anything under 90 in red, but the flag only reflects a reference range, not a diagnosis. A reading in the 80s is very close to normal, while the low 60s deserve more attention.
To be diagnosed with stage 2 kidney disease, you need an eGFR of 60 to 89 plus evidence of ongoing kidney damage lasting 3 months or more.3National Kidney Foundation. Stage G2 Chronic Kidney Disease (CKD) The most common damage marker is protein leaking into the urine. Others include blood in the urine or structural changes on imaging.
Stages 3 to 5 begin below 60, and that is where symptoms and medication changes become common. Mildly decreased filtration almost never causes symptoms, and most people in this range never progress to kidney failure.
Your number comes from a formula, not a direct measurement. Because the figure is an estimate, the true value can sit several points above or below what is printed, so a 74 and a 78 on different days may not be a real difference. The formula also assumes an average body, so it can be off for people who are very muscular, very small, or very large.
Look at your past results on the portal: a number that has sat at 75 for years means something very different from a first-ever drop from 105. A mild reading in this range is not an emergency and does not call for changing your diet or medicines on your own.
Reasons the Number Can Read Low Without Kidney Damage
Both measured and estimated filtration decline with age starting in the thirties, a normal part of aging.4PubMed. Should eGFR Thresholds Be Adjusted for Age? Over the decades the kidneys lose some of their tiny filtering units.5PubMed. Should eGFR Thresholds Be Adjusted for Age? Using one cutoff for every age may label many older adults with normal age-related decline as having disease.6PubMed Central. Accounting for Age in the Definition of Chronic Kidney Disease A 75-year-old with an eGFR of 65 and normal urine is often within the expected range for their age, especially if the number has been stable over time. That doesn’t mean older people can ignore it. A quick fall or abnormal urine protein needs follow-up at any age.
Dehydration causes temporary dips.7MyNephrologist. How to Read Your Kidney Function Test Results When you are low on fluid, less blood reaches the kidneys, so they filter less for a while and creatinine in the blood rises. A test taken after fasting, heavy sweating, or illness may therefore read lower than your usual level. The effect usually reverses once you rehydrate, which is one reason a repeat test is so useful.
Creatinine comes from muscle, which releases it at a fairly steady rate. A person with more muscle makes more of it, so very muscular people can read low even when their filtration is fine. The opposite happens in people who are frail, older with muscle loss, or who have lost weight through illness. Their creatinine may look normal while their filtration is actually lower, so they can read falsely high. Estimates are least accurate at either end of muscle mass.8PubMed Central. Impact of Muscle Mass on the Performance of Creatinine‐Based eGFR Equations and Mortality Risk Assessment After Kidney Transplantation Heavy training and high-protein diets can raise creatinine and lower eGFR on paper, so tell your doctor about your training before assuming decline.
A blood test called cystatin C gives a better estimate when muscle mass is unusual, because it doesn’t depend on muscle.9PubMed Central. Muscle mass and estimates of renal function: a longitudinal cohort study Combining creatinine and cystatin C matches true filtration more closely than either alone, especially near normal function.10PubMed. Improved GFR estimation by combined creatinine and cystatin C measurements
Some reports list several eGFR values from different formulas. “cr” means creatinine-based and “cys” means cystatin C-based, so “eGFRcr-cys” is the combined value, which is usually the most reliable. The cystatin C test sometimes reads lower than the creatinine one, moving people into the under-60 group, so ask which one your doctor is using.
To make your next test a fair one, drink normally the day before unless you are told to fast. Avoid an unusually heavy meat meal or a hard workout right before the draw. Tell the lab or doctor if you were sick, vomiting, or had diarrhoea recently, and mention creatine supplements, which can raise creatinine.
The Urine Test That Decides Whether It Matters
The two core kidney measurements are the eGFR blood test and a urine test called the UACR, or urine albumin-to-creatinine ratio.11Ulta Lab Tests. Chronic Kidney Disease: Why eGFR and Urine Albumin Must Be Read Together It measures how much of the protein albumin is in a urine sample. Healthy kidneys keep albumin in the blood, so finding it in urine suggests the filters are leaking. A result of 30 mg/g or more is the usual threshold for abnormal protein loss. A routine urinalysis can add clues such as blood or cells in the urine.12Ulta Lab Tests. Chronic Kidney Disease: Why eGFR and Urine Albumin Must Be Read Together
Together with your filtration number, the UACR places you on a chart doctors use to judge risk. A mildly low eGFR with a normal UACR is a much lower-risk combination than the same eGFR with protein in the urine.
The test uses a ratio because urine concentration varies through the day. Comparing albumin to creatinine in the same sample corrects for how diluted or concentrated the urine is. That makes a single small sample, ideally the first urine of the morning, a reasonable stand-in for a full day’s collection.
Many routine panels include eGFR but not the urine protein test. Ask for it if you have diabetes, high blood pressure, or a family history of kidney disease.
Hard exercise in the previous day, a fever, a urinary tract infection, and uncontrolled high blood sugar can all push albumin up for a short time. Menstrual bleeding can contaminate a sample, so tell the clinic if your period is due. Because of this, an abnormal result is usually repeated, and kidney damage is suspected when it stays high over a few months.
Even small protein amounts matter. In people without diabetes, slightly higher urine albumin, still within the normal range, was tied to faster filtration loss over time.13PubMed Central. Mild Albuminuria Is a Risk Factor for Faster GFR Decline in the Nondiabetic Population In people with type 2 diabetes, a UACR above about 8 mg/g, well below the usual cutoff, was linked to nearly double the risk of kidney disease getting worse.14PubMed Central. The Lower Limit of Reference of Urinary Albumin/Creatinine Ratio and the Risk of Chronic Kidney Disease Progression in Patients With Type 2 Diabetes Mellitus
Whether It Affects Your Heart and Future Health
People with an eGFR of 60 to 69 had more early artery hardening and higher risk of heart disease and kidney disease worsening over time.15PubMed Central. Association of Mildly Reduced Kidney Function With Cardiovascular Disease: The Framingham Heart Study But in a large analysis, heart disease and stroke risk was lowest for eGFR between 60 and 105, rising mainly below 60.16PubMed. Mild-to-Moderate Kidney Dysfunction and Cardiovascular Disease: Observational and Mendelian Randomization Analyses A reading in the 80s carries little extra risk, while the 60s are a signal to manage heart risk factors.
A mildly low eGFR often travels with other factors such as high blood pressure, high cholesterol, diabetes, or smoking, and those are the parts you can address. That’s why doctors may ask about cholesterol and blood pressure alongside a kidney result in this range.
The kidneys and heart share the same blood vessel health, so the factors that damage the arteries, like high blood pressure and high blood sugar, also strain the kidneys. A mildly lower kidney number can be an early clue that blood vessels elsewhere deserve attention.
How fast eGFR changes matters more than one value. In people with type 2 diabetes, a drop of more than about 8% in a year strongly predicted later kidney failure.17PubMed Central. One-year eGFR decline rate is a good predictor of prognosis of renal failure in patients with type 2 diabetes An 8% drop from 65 is only about five points, which is easy to dismiss without comparing results.
Small ups and downs of a few points between tests are normal variation. A steady slide across several years is more meaningful than one low value, so keep copies of past results to show your doctor. A stable low-60s number with a normal urine test usually leads to routine monitoring rather than treatment.
What Speeds Up Decline and What Slows It
Besides urine protein, higher systolic blood pressure (the top number) was most strongly linked to faster eGFR loss.18PubMed Central. Distribution of estimated glomerular filtration rate and determinants of its age dependent loss in a German population-based study High pressure over years damages the small vessels inside the kidneys, which reduces filtering and can cause protein to leak. Home readings taken at the same time each day give a fuller picture than occasional clinic readings, which can run high from nerves.
In people with diabetes, a higher HbA1c, the long-term blood sugar test, also predicted faster decline.19PubMed Central. Determinants of Decline in Glomerular Filtration Rate in Nonproteinuric Subjects with or without Diabetes and Hypertension ACE inhibitors and ARBs, common blood pressure pills, lower both pressure and urine protein and protect kidneys better than other blood pressure drugs, especially when urine protein is raised.20PubMed. Managing kidney disease with blood-pressure control These drugs reduce pressure inside the kidney’s filters, so filtration can fall a little in the first weeks even as the kidney is being protected. A small dip in eGFR after starting intensive blood pressure treatment did not signal faster long-term decline.21PubMed Central. Initial Estimated Glomerular Filtration Rate Decline and Long-Term Renal Function During Intensive Antihypertensive Therapy Doctors usually recheck blood work within a few weeks of starting them. A modest dip is expected, while a large or continuing fall is the signal to call your doctor. Don’t stop a prescribed blood pressure pill because your eGFR dipped slightly; talk to your doctor first.
The highest salt intake was linked to about 50% higher odds of a large eGFR drop.22PubMed Central. Associations of Diet with Albuminuria and Kidney Function Decline Higher intake of beta-carotene, found in orange and dark green vegetables, appeared protective.23PubMed Central. Associations of Diet with Albuminuria and Kidney Function Decline Cutting salt and eating more vegetables is a reasonable step at this stage. Most salt comes from packaged and restaurant food rather than the salt shaker, so reading labels and choosing less processed options does most of the work.
There is no special kidney diet for a mildly low number. A pattern heavy in vegetables, fruit, whole grains, and legumes suits kidneys and heart alike. Strict low-protein diets are designed for established kidney disease and supervised by a dietitian, not for a mildly low number on its own.24PubMed Central. Nutritional and Dietary Management of Chronic Kidney Disease Under Conservative and Preservative Kidney Care Without Dialysis If your doctor later finds a reason to limit potassium or phosphorus, that comes with specific advice, so you don’t need to restrict them now.
Common painkillers like ibuprofen and naproxen, along with some heartburn drugs, are among medicines that can harm kidneys.25PubMed Central. Drug stewardship for people with chronic kidney disease; towards effective, safe, and sustainable use of medications Use these sparingly and mention your eGFR when a new drug is prescribed. For occasional pain, acetaminophen may be a better choice, if it’s appropriate for you. Many medicines remain safe with lower kidney function, sometimes at adjusted doses.26National Kidney Foundation. Safe Medicine Use with Chronic Kidney Disease Staying hydrated helps, though there’s no need to force large amounts of water.
Next Steps After a Mildly Low Result
Because diagnosis requires changes lasting 3 months, a single low result is usually repeated before any label is given.27National Kidney Foundation. Stage G2 Chronic Kidney Disease (CKD) The usual first step is a repeat blood test and a urine albumin test, often within a few weeks to a few months. If urine and repeat results are normal, many doctors simply recheck yearly, more often with diabetes or high blood pressure. An abnormal urine result or a falling number leads to closer follow-up. Ask your doctor to set the date rather than guessing. Writing down your questions and a short list of what has changed lately, such as illness or new medicines, makes the appointment more useful.
Useful questions to bring:
- Was this creatinine- or cystatin C-based, and should I get the other?
- Has my urine been checked for protein?
- How does this compare with my past results?
- Do any of my medicines or supplements need review?
- When should I be rechecked?
Most people with a mild decrease are managed by their regular doctor. Referral to a kidney specialist is usual for an eGFR below 30, heavy urine protein, or a fast drop. Blood in the urine along with protein also prompts referral.