Table 1 Equations to be used to estimate glomerular filtration rate (GFR)

MDRD [20]

175 × Scr ^-1.154 × age^-0.203 × 0.742 [if female] × 1.212 [if black]

CKD-EPI_creatinine[10]

141 x min(Scr/κ, 1)^α × max(Scr/κ, 1)^-1.209 × 0.993^Age × 1.018 [if female] × 1.159 [if black], where 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/κ or 1, and max indicates the maximum of Scr/κ or 1

CKD-EPI_{cystatin C}[26]

133 × min(Scys/0.8, 1)^-0.499 × max(Scys/0.8, 1)^-1.328 × 0.996^Age × 0.932 [if female] where min indicates the minimum of Scr/κ or 1, and max indicates the maximum of Scr/κ or 1.

CKD-EPI_{cystatin-creatinine}[26]

135 × min(Scr/κ, 1)^α × max(Scr/κ, 1)^-0.601 × min(Scys/0.8, 1)^-0.375 × max(Scys/0.8, 1)^-0.711 × 0.995^Age × 0.969 [if female] × 1.08 [if black] where κ is 0.7 for females and 0.9 for males, α is -0.248 for females and -0.207 for males, min indicates the minimum of Scr/κ or 1, and max indicates the maximum of Scr/κ or 1.