Creatinine vs eGFR (Estimated Glomerular Filtration Rate): what's the difference?
Educational — not medical advice · Ranges vary between laboratories
The short answer: Creatinine is a substance measured in your blood. eGFR is a filtration rate calculated from that creatinine along with your age and sex. They move in opposite directions — a lower creatinine and a higher eGFR both point the reassuring way.
Because muscles produce creatinine at a steady rate, a rising blood level means the kidneys are clearing less of it. Labs often pair it with eGFR, which converts creatinine into an estimated filtration rate.
Full Creatinine guideeGFR estimates how many milliliters of blood your kidneys filter each minute, which is the best overall measure of how well they are working. It's calculated from a formula using your blood creatinine, age, and sex rather than measured directly, so it is a filtering rate, not a substance level — which is why higher numbers mean better function, the opposite of most lab values.
Full eGFR (Estimated Glomerular Filtration Rate) guideAt a glance
| Creatinine | eGFR (Estimated Glomerular Filtration Rate) | |
|---|---|---|
| Panel | Kidney panel | Kidney panel |
| Unit | mg/dL | mL/min/1.73m² |
| Typical adult range | Normal 0.6–1.2 mg/dL | Normal 90–120 mL/min/1.73m² |
| Also known as | Serum Creatinine, Cr | Estimated GFR, Glomerular Filtration Rate |
General adult reference intervals — your lab's printed range takes precedence.
Why they're often tested together
Labs report them together because creatinine alone can mislead: a muscular person makes more of it without any kidney problem, and someone with low muscle mass makes less. The eGFR formula adjusts for part of that. A single low eGFR is usually rechecked, since dehydration or a recent illness can push it down temporarily.
Questions people ask
Why is a higher eGFR the good direction?
Because it's a rate, not a level. A higher eGFR means the kidneys are clearing waste more efficiently, whereas creatinine is the waste itself — so the reassuring direction is downward for one and upward for the other.
What eGFR numbers do doctors watch?
Roughly 90 and above is generally considered normal, 60 to 89 is mildly reduced and worth monitoring, and below 60 sustained for three months or more is the threshold used to define chronic kidney disease. One low reading is usually rechecked first.
More comparisons
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