Calculate fat-free mass — calc

Get an estimate of fat-free mass (FFM, in kg) based on weight, height, and sex (and age for Storset equation).

Usage

calc_ffm(
  weight = NULL,
  bmi = NULL,
  sex = NULL,
  height = NULL,
  age = NULL,
  method = c("janmahasatian", "green", "al-sallami", "storset", "bucaloiu", "hume",
    "james", "garrow_webster"),
  digits = 1
)

Arguments

weight: total body weight in kg
bmi: BMI, only used in green method. If weight and height are both specified, bmi will be calculated on-the-fly.
sex: sex, either male of female
height: height in cm, only required for holford method, can be used instead of bmi for green method
age: age, only used for Storset equation
method: estimation method, one of janmahasatian (default), green, al-sallami, storset, bucaloiu, hume, james, or garrow_webster.
digits: round to number of digits

Value

Returns a list of the following elements:

value: Fat-free Mass (FFM) in units of kg
unit: Unit describing FFM, (kg)
method: Method used to calculate FFF

Details

References: janmahasatian, green: Janmahasatian et al. Clin Pharmacokinet. 2005;44(10):1051-65) al-sallami: Al-Sallami et al. Clin Pharmacokinet 2015 storset: Storset E et al. TDM 2016 bucaloiu: Bucaloiu ID et al. Int J of Nephrol Renovascular Dis. 2011 (Morbidly obese females) hume: Hume R. J Clin Pathol 1966 james: James WPT et al. Research on obesity: a report of the DHSS/MRC Group 1976 garrow_webster: Garrow JS, Webster J. Quetelet's index (W/H2) as a measure of fatness. Int J Obesity 1984

Overview:

Sinha J, Duffull1 SB, Al-Sallami HS. Clin Pharmacokinet 2018. https://doi.org/10.1007/s40262-017-0622-5

Examples

calc_ffm(weight = 70, bmi = 25, sex = "male")
#> $value
#> [1] 53.7
#> 
#> $unit
#> [1] "kg"
#> 
#> $method
#> [1] "janmahasatian"
#> 
calc_ffm(weight = 70, height = 180, age = 40, sex = "female", method = "storset")
#> $value
#> [1] 47.5
#> 
#> $unit
#> [1] "kg"
#> 
#> $method
#> [1] "storset"
#>