--- title: "High eGFR: what it means (and why it is usually nothing)" type: biomarker-interpretation url: "https://www.test-well.com/biomarkers/egfr/high" biomarker: eGFR direction: high reference_range: - "age 18+: 60.0 – 120 mL/min/1.73m2" reviewed_at: 2026-11-02 review_status: reviewed date_published: 2026-09-05 --- # High eGFR: what it means (and why it is usually nothing) > A high eGFR — above about 120 mL/min/1.73m², or simply reported as '>90' or '>120' — is not a disease. eGFR is calculated from creatinine (sometimes with cystatin C), so anything that lowers creatinine makes the estimate read high: low muscle mass, a vegetarian or low-meat diet, pregnancy, over-hydration, liver disease, and amputation or muscle-wasting conditions. Young adults, especially tall or athletic people, commonly estimate above 120. True 'hyperfiltration' — the kidneys filtering more than normal — occurs in early diabetes, obesity, pregnancy and after losing a kidney, and it is a marker to watch rather than treat. A high eGFR never needs follow-up for itself; the one check worth making is a urine albumin test in anyone with diabetes, because hyperfiltration and albumin leakage can be the first signs of diabetic kidney disease. ## When does this result need same-day care? - A high eGFR is never urgent. ## What is the normal range for eGFR? - age 18+: 60.0 – 120 mL/min/1.73m2 ## What are the common causes of high eGFR? 1. Low creatinine production — low muscle mass, small body size, older frail adults, amputation, muscle-wasting disease, prolonged illness; the formula reads the low creatinine as a high filtration rate 2. A vegetarian, vegan or low-meat diet — less dietary creatine means less creatinine 3. Pregnancy — the kidneys genuinely filter more and plasma volume rises; eGFR of 120–150 is normal 4. Over-hydration or intravenous fluids before the draw 5. Liver disease — less creatine is made, so creatinine is low 6. Hyperfiltration — early diabetes (before any damage shows), obesity, high-protein diets, a solitary kidney after donation or removal; the remaining nephrons work harder 7. Youth and body habitus — young, tall or athletic adults commonly estimate above 120 without any abnormality 8. Laboratory and equation differences — many labs cap the report at '>90' or '>120'; the CKD-EPI 2021 equation reads a few points higher than older ones ## What symptoms go with high eGFR? - None — a high eGFR causes no symptoms and indicates no disease - Symptoms, if any, belong to the cause: weight loss or weakness with low muscle mass; thirst, frequent urination and fatigue with undiagnosed diabetes ## What do clinicians usually check next? - Nothing for the eGFR itself — a value above range is not a kidney problem - Look at the creatinine it was calculated from, and at your body size and diet; a low creatinine in a small, older, vegetarian or frail person explains the estimate - A cystatin C–based eGFR when an accurate kidney number matters (drug dosing, transplant donation, muscle-wasting conditions) — cystatin C is independent of muscle mass - In diabetes or obesity: a urine albumin-to-creatinine ratio once a year — hyperfiltration with albumin in the urine is the earliest stage of diabetic kidney disease and the stage at which blood pressure, glucose and SGLT2 or GLP-1 treatment protect the kidneys most - Blood pressure and A1c if they have not been checked, since hyperfiltration is a reason to be sure diabetes is not being missed - Do not repeat the test for the high eGFR; it will be on the next routine metabolic panel Follow-up tests at TestWell: [Glucose Test](https://www.test-well.com/tests/glucose-basic) ($14.99). KDIGO recommends measuring eGFR (alongside urine albumin) at least once a year in people with chronic kidney disease, and more often at more advanced stages or higher risk — as frequently as every 1–3 months. Adults with diabetes or high blood pressure are generally checked yearly even with normal kidney function. ## How do you recheck eGFR? | Test or panel | Type | Price | Fasting | Results | | --- | --- | --- | --- | --- | | [Kidney Health Panel](https://www.test-well.com/tests/kidney-health-panel) | Panel (4 tests) | $64.99 | Yes | 2–4 business days | | [Total Body Essentials Panel](https://www.test-well.com/tests/total-body-essentials-panel) | Panel (39 tests) | $399.99 | Yes | 3–7 business days | | [Total Body Panel](https://www.test-well.com/tests/total-body-panel) | Panel (49 tests) | $599.99 | Yes | 5–10 business days | | [Renal Function Test (Renal Panel)](https://www.test-well.com/tests/renal-panel) | Test | $22.99 | No | 2–4 business days | Plus one $6 lab processing fee per order; physician authorization included. ## Common questions ### Is a high eGFR bad? No. eGFR estimates kidney filtration from creatinine, and a high value means either that your creatinine is low (small body, low muscle mass, plant-based diet, pregnancy) or that your kidneys are filtering briskly. Neither is a disease, and no treatment is directed at a high eGFR. ### What does an eGFR over 120 mean? Usually that the formula is running off a low creatinine. Young, tall, athletic and pregnant people, vegetarians and people with low muscle mass all commonly estimate above 120. In someone with diabetes or obesity it can represent hyperfiltration, which is a reason to check urine albumin, not a problem in itself. ### What is hyperfiltration? The kidneys filtering more than normal — seen in early diabetes, obesity, pregnancy and after losing a kidney, when the remaining nephrons work harder. It is harmless in pregnancy and usually in healthy people; in diabetes it can precede kidney damage, so it is a prompt to keep glucose and blood pressure controlled and to check urine albumin yearly. ### Why does my lab only say '>90' or '>120'? Because the equation is imprecise at high values and small changes in creatinine swing the estimate widely, so many labs cap the report. '>90' means normal kidney function; the exact number above that adds nothing clinically. ### Can a high eGFR hide kidney disease? Occasionally, in people with very low muscle mass — their creatinine is so low that the estimate reads normal or high even when filtration is reduced. A cystatin C–based eGFR, which does not depend on muscle, gives the true picture when it matters. Urine albumin is the other half of kidney assessment and is unaffected by this. ### Should I retest a high eGFR? Not for the eGFR itself. If you have diabetes or high blood pressure, the yearly kidney check (eGFR plus urine albumin) is what matters; otherwise it will be on the next routine panel. ## Related - [What does a low eGFR mean?](https://www.test-well.com/biomarkers/egfr/low) - [eGFR reference ranges](https://www.test-well.com/biomarkers/egfr) - [Glucose reference range](https://www.test-well.com/biomarkers/glucose) - [Creatinine reference range](https://www.test-well.com/biomarkers/creatinine) - [BUN reference range](https://www.test-well.com/biomarkers/bun) ## Sources - [National Kidney Foundation](https://www.kidney.org/atoz/content/gfr) - [KDIGO 2024 Clinical Practice Guideline for the Evaluation and Management of Chronic Kidney Disease](https://doi.org/10.1016/j.kint.2023.10.018) --- Medically reviewed by Youmna DiStefano, MD (Medical Reviewer, TestWell); last reviewed 2026-11-02. Review policy: https://www.test-well.com/reviewers/youmna-distefano-md Canonical page: https://www.test-well.com/biomarkers/egfr/high Machine-readable catalog: https://www.test-well.com/api/catalog.json · MCP server: https://www.test-well.com/mcp · Overview for agents: https://www.test-well.com/llms.txt Prices are cash-pay, in USD, and include physician authorization; every order adds one flat $6 lab processing fee. Educational content is not a diagnosis — discuss results with a clinician.