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. 2023 Aug 5;33(3):030501. doi: 10.11613/BM.2023.030501

Table 3. Equations to calculate eGFR from serum creatinine and cystatin C.

Age (years) Sex SCr (µmol/L) SCys (mg/L) eGFRCr-Cys
≥ 18 Female ≤ 61.9 ≤ 0.80 135 x (SCr / 61.88)-0.219 x (SCys / 0.8)-0.323 x 0.9961Age x 0.963
> 0.80 135 x (SCr / 61.88)-0.219 x (SCys / 0.8)-0.778 x 0.9961Age x 0.963
> 61.9 ≤ 0.80 135 x (SCr / 61.88)-0.544 x (SCys / 0.8)-0.323 x 0.9961Age x 0.963
> 0.80 135 x (SCr / 61.88)-0.544 x (SCys / 0.8)-0.778 x 0.9961Age x 0.963
Male ≤ 79.6 ≤ 0.80 135 x (SCr / 79.56)-0.144 x (SCys / 0.8)-0.323 x 0.9961Age
> 0.80 135 x (SCr / 79.56)-0.144 x (SCys / 0.8)-0.778 x 0.9961Age
> 79.6 ≤ 0.80 135 x (SCr / 79.56)-0.544 x (SCys / 0.8)-0.323 x 0.9961Age
> 0.80 135 x (SCr / 79.56)-0.544 x (SCys / 0.8)-0.778 x 0.9961Age
SCr - serum creatinine. SCys - serum cystatin C. eGFR - estimated glomerular filtration rate. Adapted from reference 67.