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"
#>