﻿ Anthropometrics Anthropometric formulas     Adults Lean body weight (LBW)   Devine equation: LBW (Males) = 50 + [ 2.3 x  (60 - Height in inches) ] LBW (Females) = 45.5 +  [ 2.3 x  (60 - Height in inches) ]     Hume equation: LBW (Males) = (0.3281 x Weight in kg) + (0.33939 x Height in cm) - 29.5336 LBW (Females) = (0.29569 x Weight in kg) + (0.41813 x Height in cm) - 43.2933     The Devine method is the default result.  For short stature patients (less than 60 inches), the Hume method is utilized when its result is less than baseline LBW (50kg for males, 45.5kg for females) and greater than Devine.   Please note that neither of these method is valid in amputees.   Body surface area (BSA)   Mosteller equation: BSA  =  Square root of  (HT X WT) / 3600  where                  HT = height in centimeters          WT = weight in kilograms     Serum Creatinine Adjustement for IDMS CREAT   If your laboratory utilizes the IDMS traceable creatinine, the serum creatinine must be adjusted in order to use older equations such as Cockroft and Gault:   Non-IDMS SrCr (mg/dL) = IDMS CREAT (mg/dL) x 1.065 + 0.067     Creatinine Clearance (CrCl) per Cockroft and Gault   The default method uses Lean Body Weight. The reason for this is, creatinine is a by-product of muscle metabolism, not fat. Therefore, excess weight, in the form of fat, does not significantly affect the production of creatinine   You may optionally choose to calculate with an Adjusted body weight:   1.   Calculate body weight adjusted for obesity* (ABW)  ABW = LBW + [0.3 x (WT-LBW)]  where                  WT = actual body weight in kg          LBW = lean body weight in kg   *Obesity defined as BMI > 30.     2.   Calculate creatinine clearance (CrCl)  CrCl Males = [ABW x (140 - Age)] / (SrCr x  72)  CrCl Females = 85% of male value  where                  SrCr = the most recent serum creatinine in mg/dL          ABW = adjusted body weight in kg     Note: For optional CrCl methods, please see the help topic Other Creatinine Clearance Methods.     Pediatrics Lean body weight (LBW)   Traub equation: LBW = (HT2 x  1.65)/1000  where                  HT = height in centimeters     Body surface area (BSA)   Haycock equation: BSA  =  0.024265 x HT 0.3964 x WT 0.5378  where                  HT = height in centimeters          WT = weight in kilograms       Creatinine Clearance (CrCl) per Schwartz   CrCl =  (k x HT/SrCr) x  (1.73/BSA)  where          HT = height in centimeters          SrCr = the most recent serum creatinine in mg/dL          k = 0.33 if weight < 2.5 kg          k = 0.45 if age <1 year          k = 0.55 if age 1-12 years