Estimated GFR (eGFR)

Blood

Comprehensive Metabolic Panel (CMP)

Estimated GFR (eGFR) is a calculated measure of how much blood your kidneys filter each minute, giving an overall picture of kidney filtration efficiency. A preventive practice tracks eGFR as a headline indicator of kidney health and a key input into long-term risk assessment.

What It Measures

Estimated glomerular filtration rate; kidney filtration efficiency

Optimal vs. Lab Range

Longevity Optimal

>90 mL/min

Target range for optimal health and longevity based on research.

Standard Lab

>60 mL/min (>90 normal)

Population-based reference range from standard labs.

Why It Matters

eGFR is one of the most important numbers for understanding kidney function and, by extension, long-term health, since the kidneys influence blood pressure, cardiovascular risk, and overall resilience. Here a higher value is favorable, while a declining eGFR signals worsening kidney function, and a level below 60 is used in staging chronic kidney disease. Because kidney decline often progresses quietly and compounds cardiovascular and mortality risk, watching the trend over time is more informative than any single reading. It is interpreted alongside creatinine, cystatin C, and albumin-to-creatinine ratio for a fuller view.

When Low

Kidney disease progression; <60 = chronic kidney disease staging

When High

N/A — high GFR is favorable

How to Optimize

Protecting eGFR centers on preserving kidney function through physician-directed strategies, with blood pressure management being one of the most important levers. In appropriate patients, clinicians may prescribe kidney-protective medications such as SGLT2 inhibitors, which are physician-directed therapies rather than self-directed steps. Supporting overall metabolic and cardiovascular health, staying well hydrated, and monitoring the trend all help safeguard filtration over time. eGFR is best interpreted with creatinine, cystatin C, and urinary albumin. Targets and treatment are individualized with your physician; this content is educational and not a substitute for medical advice.

Key Interventions & Linked Compounds

Strong evidence

Key Interventions

Kidney-protective protocols

BP management

SGLT2 inhibitors

Linked Compounds & Supplements

NAC

Omega-3

CoQ10

Curated from clinical literature. Individual results vary; consult a qualified clinician before changing a protocol.

Ordering Notes

Specimen

Serum or plasma (venous draw)

Patient prep

No fasting required. Maintain usual diet and medications unless advised.

Recommended cadence

Annual

Reporting unit

Confirm with the performing lab — units vary by region.

Pre-analytic notes

Standardize draw time of day, hydration, and recent exercise. Note any acute illness, supplements, or hormonal therapies on the requisition.

Recommended Follow-Up Actions

1
Confirm the result is reliable
Repeat abnormal values before acting — preferably from the same lab, same time of day, and under consistent prep. Rule out acute illness, recent intense exercise, or medication effects that can shift Estimated GFR (eGFR).
2
Compare against optimal, not just lab range
Use the optimal window above as the target. Lab "normal" is built from the general population and often misses early dysfunction.
3
Pair with related markers
Order a complementary panel covering metabolic, inflammatory, and hormonal context to interpret this marker properly.
4
Discuss interventions with a clinician
Use the interpretation guidance above to frame the conversation. Bring trends, not just one datapoint, to your visit.
5
Re-test on a defined cadence
If a change is implemented, re-measure in 8–12 weeks for fast-moving markers, or 3–6 months for slower ones, to confirm response before escalating.