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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