Table 1 Showing the various eGFR equations used in CKD population

²⁰CKD-EPI _creatinine

eGFR = 141 ×min(Scr/κ, 1)^α × max(Scr/κ, 1)^−1.209 X 0.993^Age × 1.018 [if female] × 1.159 [if black] where:

28 (6)

S_cr is serum creatinine in μmol/L,

κ is 61.9 for females and 79.6 for males,

α is − 0.329 for females and − 0.411 for males,

min indicates the minimum of S_cr/κ or 1,

and max indicates the maximum of S_cr/κ or 1.

The unit of results is ml/min/1.73 m²

³⁴CKD-EPI _{Cystatin C}

eGFR =  133 ×min(S_cys/0.8, 1)^−0.499 × max(S_cys/0.8, 1)^−1.328 × 0.996^Age0.932 [If female]

28 (6)

The unit of results is ml/min/1.73 m²

⁴²CKD-EPI _BTP*

eGFR =  55 *^BTP−0.695 × 0.998^Age × 0.899 [If female]

30.1 (6.4)

The unit of results is ml/min/1.73 m²

²⁵Cockcroft-Gault

Creatinine clearance (eGFR) = ((1.23 [If male], 1.04 [If female) × Weight in kg × (140 − age))/Creatinine

Not reported

The unit of results is ml/min

³⁴CKD-EPI _{creatinine-cystatin C}

eGFR =  135 ×min(S_Cr/κ, 1)^α ×max(S_Cr/κ, 1)^−0.601 × min(S_cys/0.8, 1)^−0.375 × max(S_cys/0.8, 1)^−0.711 × 0.995^Age × 0.969 [if female] × 1.08 [if black]

28 (6)

κ = 61.9 (females) or 79.6 (males)

α = − 0.248 (females) or − 0.207 (males)

min(S_Cr/κ or 1) = indicates the minimum of S_Cr/κ or 1

max(S_Cr/κ or 1) = indicates the maximum of S_Cr/κ or 1

min(S_cys/0.8, 1) = indicates the minimum of S_cys/0.8, 1

max(S_cys/0.8, 1) = indicates the maximum of S_cys/0.8, 1

The unit of results is ml/min/1.73 m²

⁵³Jelliffe

Creatinine clearance (eGFR) = 98–16×(age − 20/20)/(Creatinine/88.4). For females, multiply by 0.9

Not mentioned

The unit of results is ml/min/1.73 m²

¹⁹Salazar-Corcoran

For males creatinine clearance (eGFR) = (137 − age)× ((0.287 ×weight in kg) + (12.1×height in meters²))/51×Creatinine

Developed for obesity but not in common use

For females creatinine clearance (eGFR) = (146 − age)× ((0.287 ×weight in kg) + (9.74 ×height in meters²))/60×Creatinine

The unit of results is ml/min