CKD-EPI 2009

Adult2009

Previous version of CKD-EPI equation with race coefficient

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Calculate CKD-EPI 2009

Enter the values required by this equation to estimate the result.

Enter all required values to see the result.

For educational and clinical reference use. Interpret results in clinical context.

Formula

eGFR=141×min⁡(Scr/κ,1)α×max⁡(Scr/κ,1)−1.209×0.993age×sex factor×race factor\text{eGFR} = 141 \times \min(S_{cr}/\kappa, 1)^{\alpha} \times \max(S_{cr}/\kappa, 1)^{-1.209} \times 0.993^{\text{age}} \times \text{sex factor} \times \text{race factor}

Formula constants

SymbolDescriptionValue
141Base coefficient
κ\kappaSex-dependent creatinine coefficient
Female:0.7mg/dL
Male:0.9mg/dL
α\alphaExponent when SCr/κ < 1
Female:−0.329
Male:−0.411
−1.209Exponent when SCr/κ ≥ 1
0.993Age decay factor (base for age exponent)per year
Sex factorSex-dependent multiplier
Female:1.018
Male:1.000
Race factorRace-dependent multiplier
Black:1.159
Other:1.000
ScrS_{cr}inputSerum creatininemg/dL
AgeinputPatient ageyears

Required inputs

AgeSexCreatinine
Optional:Race

Validated age range

18 to 120 years

Limitations

  • Race-based adjustments may not be appropriate
  • Superseded by race-free 2021 equation
  • Less accurate in pregnancy
  • Less accurate with extremes of muscle mass

Clinical notes

  • Previous CKD-EPI equation with race coefficient
  • Now superseded by CKD-EPI 2021
  • Included for historical comparison
  • May overestimate GFR in Black patients

References

  • [1]Levey AS, Stevens LA, Schmid CH, et al. A new equation to estimate glomerular filtration rate. Ann Intern Med. 2009;150(9):604-612. doi:10.7326/0003-4819-150-9-200905050-00006
  • [2]Stevens LA, Claybon MA, Schmid CH, et al. Evaluation of the Chronic Kidney Disease Epidemiology Collaboration equation for estimating the glomerular filtration rate in multiple ethnicities. Kidney Int. 2011;79(5):555-562. doi:10.1038/ki.2010.462
  • [3]Delgado C, Baweja M, Crews DC, et al. A unifying approach for GFR estimation: recommendations of the NKF-ASN Task Force on Reassessing the Inclusion of Race in Diagnosing Kidney Disease. J Am Soc Nephrol. 2021;32(12):2994-3015. doi:10.1681/ASN.2021070988

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