Skip to main content

Table 1 Calculations employed

From: A comparison of estimates of glomerular filtration in critically ill patients with augmented renal clearance

Formulae

24 hour CLCR = (UCR × UVol/SCR × 1440) × 1.73/BSA

8 hour CLCR = (UCR × UVol/SCR × 480) × 1.73/BSA

BSA = 0.007184 × (Ht)0.725 × (Wt)0.425

CG CLCR = (140-Age) × Wt × 1.73/(SCR × 72 × BSA) × 0.85 if female

Modified CG CLCR = if SCR <1, use 1

4-variable MDRD eGFR = 186 × SCR -1.154 × age-0.203 × 1.210 if black × 0.742 if female

6-variable MDRD eGFR = 170 × SCR -0.999 × BUN-0.17 × SAlb 0.318 × Age-0.176 × 1.18 if black × 0.762 if female

  1. BSA, body surface area (m2); BUN, blood urea nitrogen (mg/dl); CG CLCR, Cockcroft-Gault creatinine clearance (ml/min/1.73 m2); CLCR , creatinine clearance (ml/min/1.73 m2); eGFR, estimated glomerular filtration rate (ml/min/1.73 m2); Ht, height (cm); MDRD, modification of diet in renal disease; SAlb, serum albumin concentration (g/dl); SCR, serum creatinine concentration (mg/dl); UCR, urinary creatinine concentration (mg/dl); UVol, urinary volume (ml); Wt, weight (Kg).