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. Author manuscript; available in PMC: 2009 Oct 19.
Published in final edited form as: Ann Intern Med. 2009 May 5;150(9):604–612. doi: 10.7326/0003-4819-150-9-200905050-00006

Table 2. The CKD-EPI Equation for Estimating GFR on the Natural Scale*.

Race and Sex Serum Creatinine μmol/L (mg/dL) Equation
Black
 Female ≤62 (≤0.7) GFR = 166 × (Scr/0.7)-0.329 × (0.993)Age
>62 (>0.7) GFR = 166 × (Scr/0.7)-1.209 × (0.993)Age
 Male ≤80 (≤0.9) GFR = 163 × (Scr/0.9)-0.411 × (0.993)Age
>80 (>0.9) GFR = 163 × (Scr/0.9)-1.209 × (0.993)Age
White or other
 Female ≤62 (≤0.7) GFR = 144 × (Scr/0.7)-0.329 × (0.993)Age
>62 (>0.7) GFR = 144 × (Scr/0.7)-1.209 × (0.993)Age
 Male ≤80 (≤0.9) GFR = 141 × (Scr/0.9)-0.411 × (0.993)Age
>80 (>0.9) GFR = 141 × (Scr/0.9)-1.209 × (0.993)Age

CKD-EPI = Chronic Kidney Disease Epidemiology Collaboration; GFR = glomerular filtration rate.

*

Expressed for specified race, sex, and serum creatinine level. To convert GFR from mL/min per 1.73 m2 to mL/s per 1.73 m2, multiply by 0.0167. We derived equation coefficients from pooled development and internal validation data sets.

The CKD-EPI equation, expressed as a single equation, is GFR = 141 × min(Scr/κ, 1)α × max(Scr/κ, 1)-1.209 × 0.993Age × 1.018 [if female] _ 1.159 [if black], where Scr is serum creatinine, κ is 0.7 for females and 0.9 for males, α is -0.329 for females and -0.411 for males, min indicates the minimum of Scr/κor 1, and max indicates the maximum of Scr/κ or 1. In this table, the multiplication factors for race and sex are incorporated into the intercept, which results in different intercepts for age and sex combinations.