All content on Lab Tests Online has been reviewed and approved by our Editorial Review Board.
Were you looking instead for Epidermal Growth Factor Receptor, also known as EGFR? If so, see the article on the EGFR test.
At a Glance
Why Get Tested?
To assess kidney function and diagnose, stage, and monitor chronic kidney disease (CKD)
When to Get Tested?
When your health practitioner thinks that you may have kidney damage or that you may be at risk for developing kidney disease
A blood sample drawn from a vein in your arm; the eGFR is a calculated estimate of the actual glomerular filtration rate and is based on your blood creatinine level along with other variables that may include your age, sex, and race as well as possibly your height and weight, depending on the equation used.
Test Preparation Needed?