﻿ Anthropometric formulas
 Anthropometric formulas See also
 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   Creatinine Clearance (CrCl) per Jelliffe Multistep Method 1.        Estimate urinary creatinine excretion rate   E (males) = LBW x (29.305 -[0.203 x (age)]) E (females) = LBW x (25.3 -[0.18 x (age)])   2.        Correct for rising serum creatinine   E = E - [4 x LBW x (SrCr1-SrCr2)] / D where          LBW = lean body weight in kilograms SrCr1= the latest serum creatinine SrCr2= the earlier serum creatinine D = the number of days between   3.        Calculate corrected creatinine clearance (CrCl)   CrCl/1.73 m2 =  (E * 0.12) / (SrCr * BSA) where          SrCr is the most recent serum creatinine in mg/dL BSA = Body surface area   Creatinine Clearance (CrCl) per Cockroft and Gault 1.        Calculate body weight adjusted for obesity* (ABW)  ABW = LBW + [0.3 x (WT-LBW)]  where          WT = actual body weight          LBW = lean body weight   *Obesity defined as BMI > 30..   2.        Calculate creatinine clearance (CrCl)   CrCl Males = [Wt x (140 - Age)] / (SCr x  72) CrCl Females = 85% of male value where          SCr is the most recent serum creatinine in mg/dL  Wt = LBW in normal weight patients or ABW in obese patients   Optional CrCl methods Cockcroft and Gault TBW This variation of the C&G equation uses Total Body Weight instead of Ideal Body Weight. Be aware however, that this tends to over-estimate CrCl in larger patients. CrCl Males = [TBW x (140 - Age)] / (SCr x  72) CrCl Females = 85% of male value   Cockcroft and Gault Normalized Removes weight from the C&G equation. Some find this variation useful in patients whose body size is substantially different from average. This is also the method used when "Adjust CL to IBW" is checked. CrCl Males = (140 - Age) / SrCr CrCl Females = 85% of male value   Jelliffe 1973 Weight is not used in this equation either, therefore, some find this method useful in patients whose body size is substantially different from average: CrCl Males = 98 - (0.8 x (Age-20)) / SrCr CrCl Females = 90% of male value   MDRD (abbreviated) Derived from a large study of patients with a wide range of kidney function. Some feel this is a more accurate GFR method overall. GFR Males = exp[ 5.228 - ( 1.154 x  log{SrCr} )  - ( 0.203  x  log{Age} ) GFR Female = 74.2% of male value For African Americans multiply by 1.21   It is important to note that MDRD calculates GFR which does not directly correlate to CrCl   Salazar and Corcoran Derived from a study of obese patients. Some recommend this method for obese patients instead of the standard equations. CrCl Males        = { ( 137 - Age ) x [ ( 0.285 x Wt)  + (12.1 x Ht2 )] }  /  (51 x SrCr) CrCl Females        = { ( 146 - Age ) x [ ( 0.287 x Wt)  + (9.74 x Ht2 )] }  /  (60 x SrCr)     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/Scr) 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

Copyright 1999-2018 by RxKinetics. All rights reserved.