eGFR (Creatinine)

An estimate of how well your kidneys filter waste, using a routine blood creatinine test.

Last reviewedJune 16, 2026

Serum

sample type

~5 mL

blood needed

~7 days

results in app

Any time of day

best timing

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On this page

Why test Reference ranges What you'll learn What affects it How testing works Sources FAQ

In short

eGFR stands for estimated glomerular filtration rate. It is not measured directly but calculated, usually from your blood creatinine along with your age and sex, using the CKD-EPI equation.

It estimates how many millilitres of blood your kidneys filter each minute, and it is the standard way to summarise overall kidney function in a single number.

Kidney Function

Reviewed against DGKL reference practice.

Why test this?

A lower eGFR means your kidneys are filtering less well. It is the main number used to stage chronic kidney disease, from G1 (normal) down to G5 (kidney failure). A result below 60 that lasts three months or more defines chronic kidney disease.

Because it is calculated from creatinine, the same limits apply. Muscle mass and diet can affect it, which is why a cystatin C based eGFR is sometimes used to confirm a result.

What is a normal result?

Aniva reads your result against research-backed ranges, not just the lab's wide normal. The reference shown below is specific to this biomarker.

Adult reference values as used by Aniva. Ranges are guidance and can vary by laboratory and method.

Group	Normal range	Optimal range
Men	80 to 140 mL/min/1.73 m²	90 to 130 mL/min/1.73 m²
Women	80 to 130 mL/min/1.73 m²	90 to 120 mL/min/1.73 m²

Your Aniva report reads your result against these values together with your age, sex and the rest of your panel.

Ranges are guidance and vary by lab and assay, aligned with DGKL practice. Always read your result against your own lab's reference interval.

What insights will this test give you?

A single number summarising your kidney function
Which kidney function stage (G1 to G5) you fall into
An early signal of declining kidney function
A baseline to track kidney health over time

What can affect this result?

What can skew the result

Because it comes from creatinine, anything that affects creatinine affects eGFR. Very high or low muscle mass, a large meat meal, intense exercise, and some medicines can shift it. It is less reliable at near normal levels, where small changes mean little.

Best interpreted with

Best read with creatinine, cystatin C, and a urine albumin to creatinine ratio, which together stage kidney health.

How is this tested?

Sample

Serum

Blood needed

~5 mL

Method

Calculated

Best timing

Any time of day

Sources. The evidence behind this

KDIGO 2024 CKD Guideline, Mayo Clinic Laboratories: eGFR, National Kidney Foundation: GFR calculator, NIH MeSH: Glomerular Filtration Rate

Common questions

What does my eGFR mean? Higher usually means kidneys filter well; lower suggests reduced filtering. Your clinician will check trends and related tests.

Do I need to fast for this test? No. Eat normally, but come well hydrated.

What can affect my result? Dehydration, hard exercise, a large cooked meat meal, creatine supplements, and some medicines can change readings.

How often should I test eGFR? At least yearly if you have risk factors. Your clinician may test more often to track changes.

How quickly will I get results? Results are usually ready in about 7 days.

What should I discuss with my clinician? Share all medicines and supplements, recent illness, pregnancy, and hydration. Ask about next steps like urine albumin or cystatin C.

Which Aniva panels include this marker?

Core

Your annual full-body baseline with more than 100 biomarkers, included in your Aniva membership.