calc_ibw {clinPK}

Calculate ideal body weight in kg for children and adults

Description

Get an estimate of ideal body weight. This function allows several commonly used equations

Usage

calc_ibw(
  weight = NULL,
  height = NULL,
  age = NULL,
  sex = "male",
  method_children = "standard",
  method_adults = "devine"
)

ibw_standard(age, height = NULL, sex = NULL)

ibw_devine(age, height = NULL, sex = NULL)

Arguments

weight

weight in kg

height

height in cm

age

age in years

sex

sex

method_children

method to use for children >1 and <18 years. Currently '"standard"' is the only method that is supported.

method_adults

method to use for >=18 years. Currently '"devine"' is the only method that is supported (Devine BJ. Drug Intell Clin Pharm. 1974;8:650-655).

Details

Equations:

<1yo Use actual body weight

1-17 years old ('standard'): if height < 5ft: IBW= (height in cm2 x 1.65)/1000 if height > 5ft: IBW (male) = 39 + (2.27 x height in inches over 5 feet) IBW (female) = 42.2 + (2.27 x height in inches over 5 feet)

Methods not implemented yet: McLaren: IBW = - step1: x = 50th percentile height for given age - step2: IBW = 50th percentile weight for x on weight-for-height scale Moore: IBW = weight at percentile x for given age, where x is percentile of height for given age BMI: IBW = 50th percentile of BMI for given age x (height in m)^2 ADA: IBW = 50th percentile of WT for given age

>= 18 years old (Devine equation) IBW (male) = 50 + (2.3 x height in inches over 5 feet) IBW (female) = 45.5 + (2.3 x height in inches over 5 feet)

Examples

calc_ibw(weight = 70, height = 170, age = 40, sex = "female")
calc_ibw(weight = 30, height = 140, age = 10, sex = "female")