Library/Kidney/eGFR/41

eGFR of 41 mL/min/1.73m²What it means, and what usually happens next

41mL/min/1.73m² eGFR
Moderately to severely decreased (G3b)
1530456090

An eGFR of 41 mL/min/1.73m² is in the 30 to 44 range KDIGO calls moderately to severely decreased (stage G3b).

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eGFR41mL/min/1.73m²
Where it fallsModerately to severely decreased (G3b)
The usual range90 or above (it drifts down with age)

What usually happens next

If it stays under 60 for more than 3 months, that alone meets the definition of chronic kidney disease.

A urine albumin-to-creatinine ratio (ACR) and blood pressure decide how closely it's followed.

When an eGFR can read wrong

Most eGFRs are worked out from creatinine, which comes from muscle. A lot of muscle, creatine supplements, a big meat meal before the test or being dehydrated can make the eGFR read lower than your kidneys really are; very little muscle can make it read higher. A cystatin C based eGFR is the usual way to check.

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Questions

Is an eGFR of 41 mL/min/1.73m² normal?

An eGFR of 41 mL/min/1.73m² is in the 30 to 44 range KDIGO calls moderately to severely decreased (stage G3b). The usual range is 90 or above (it drifts down with age).

Is an eGFR of 41 mL/min/1.73m² normal for my age?

eGFR falls slowly with age, so a value in the 60s or 70s is common in healthy older adults. What matters is whether it stays under 60 for more than 3 months, or comes with albumin in the urine.

Can an eGFR of 41 mL/min/1.73m² improve?

It can move: dehydration, a big protein meal or a hard workout before the test lowers it, and a repeat test when well hydrated often reads higher.

Worked out by LifeFrom from the KDIGO 2024 guideline, and not yet reviewed by a clinician. For your own understanding: only a lab test, read by your clinician, diagnoses anything.