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Table 1 GFR estimates (SCr serum creatinine, SCysC serum cystatine C)

From: Detection of decreased glomerular filtration rate in intensive care units: serum cystatin C versusserum creatinine

Basis of equation and sex

SCr and SCysC values

Equation for estimating GFR

MDRD

 

175 × Scr-1.154 × age-0.203 × [0.742 if female]

CKD-EPI SCr

   Female

SCr ≤ 0.7 mg/dL

144 × (Scr/0.7)-0.329 × 0.993age

SCr > 0.7 mg/dL

144 × (Scr/0.7)-1.209 × 0.993age

   Male

SCr ≤ 0.9 mg/dL

141 × (Scr/0.9)-0.411 × 0.993age

SCr > 0.9 mg/dL

141 × (Scr/0.9)-1.209 × 0.993age

CKD-EPI SCysC

SCysC ≤ 0.8 mg/L

133 × (SCysC/0,8)-0.499 × 0.996age [×0.932 if female]

SCysC >0.8 mg/L

133 × (Scys/0,8)-1.328 × 0.996age [×0.932 if female]

CKD-EPI combined

   Female

SCr ≤ 0.7 mg/dL and SCysC ≤ 0.8 mg/L

130 × (Scr/0.7)-0.248 × (SCysC/0.8)-0.375 × 0.995age

SCr ≤ 0.7 mg/dL and SCysC > 0.8 mg/L

130 × (Scr/0.7)-0.248 × (SCysC/0.8)-0.711 × 0.995age

SCr > 0.7 mg/dL and SCysC ≤ 0.8 mg/L

130 × (SCr/0.7)-0.601 × (SCysC/0.8)-0.375 × 0.995age

SCr >0.7 mg/dL and SCysC ≥ 0.8 mg/L

130 × (SCr/0.7)-0.601 × (SCysC/0.8)-0.711 × 0.995age

   Male

SCr ≤0.9 mg/dL and SCysC ≤ 0.8 mg/L

135 × (SCr/0.9)-0.207 × (SCysC/0.8)-0.375 × 0.995age

SCr ≤ 0.9 mg/dL and SCysC > 0.8 mg/L

135 × (SCr/0.9)-0.207 × (SCysC/0.8)-0.711 × 0.995age

SCr >0.9 mg/dL and SCysC ≤ 0.8 mg/L

135 × (SCr/0.9)-0.601 × (SCysC/0.8)-0.375 × 0.995age

SCr >0.9 mg/dL and SCysC > 0.8 mg/L

135 × (SCr/0.7)-0.601 × (SCysC/0.8)-0.711 × 0.995age