Kidney panel
eGFR
Also called Estimated glomerular filtration rate · measured in mL/min/1.73m²
What it measures
An estimate of how effectively the kidneys filter blood, calculated from creatinine.
Why it is tracked
The practical threshold for prescribing several medications, including metformin. Reviewed before starting and periodically during therapy.
What a provider considers
- Calculated, not measured directly
- Affected by muscle mass and hydration
- Determines metformin eligibility
Reference ranges vary between laboratories and a single result rarely means much on its own. Interpretation depends on your symptoms, your other markers and the trend over time — which is what your provider reviews.