Definition
What eGFR measures
Estimated glomerular filtration rate converts creatinine, age, and sex into an estimate of how many milliliters of blood the kidneys filter per minute. It is calculated, not directly measured.
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Kidney & electrolytesEssentialCompletemL/min/1.73m2
eGFR
The standard estimate of kidney filtration
Illustrative sample band · Synthetic
92mL/min/1.73m2
54Sample target 90–120 mL/min/1.73m2136
Why it matters
How clinicians usually read it
It is the number kidney health is staged and tracked by, and it shapes medication dosing decisions. Trends across draws matter more than one value.
When it reads low
A lower value can mean
A lower eGFR suggests reduced filtration — but hydration, recent exercise, and muscle mass can all pull the estimate down temporarily. Persistent reduction deserves clinical review.
When it reads high
A higher value can mean
A high eGFR is usually not a problem in itself. In people with low muscle mass the formula can overestimate true filtration.
Questions for a clinician
Bring the number into a real conversation
01
Is my eGFR stable across draws, or trending down?
02
Could hydration or muscle mass be skewing this estimate for me?
03
Would a urine albumin check add useful kidney context?
Educational boundary
Educational information only. Displayed ranges are illustrative sample bands, not a diagnosis, treatment plan, or substitute for the contracted laboratory report and a qualified clinician.
See it as a sample result
The sample dashboard shows an illustrative reading, target band, and trend for eGFR.