Estimate serum creatinine — calc

Calculate an estimated serum creatinine. Function takes vectorized input as well.

Usage

calc_creat(
  sex = NULL,
  age = NULL,
  weight = NULL,
  height = NULL,
  adult_method = c("johanssen", "brooks"),
  digits = 1
)

Arguments

sex: sex, either male or female
age: age in years
weight: weight in kg (default 75 kg)
height: height in cm (default 165 cm)
adult_method: estimation adult method, johanssen (default) or brooks,
digits: number of digits to round to

Details

For children and adolescents: Uses equations described in Ceriotti et al. Clin Chem. 2008, and Junge W et al. Clin Chim Acta. 2004. For age 15-18, a linear interpolation is used between equations for <15 Johanssen A et al. Ther Drug Monit 2011. For adults: Two methods are available Johanssen et al. Ther Drug Monit 2011. which describes a flat serum creatinine dependent on sex, and Brooks et al (unpublished) which is a linear regression built on the NHANES open-source data and takes into account sex, age, weight, and height. Equation: lm(SCr~Age+Sex+Weight+Height, data=NHANES)

Examples

calc_creat(sex = "male", age = 40)
#> $value
#> [1] 84
#> 
#> $unit
#> [1] "micromol/L"
#> 
#> $method
#> [1] "johanssen"
#> 
calc_creat(sex = "male", age = 40, weight = 100, height = 175, adult_method = "brooks")
#> $value
#> [1] 84.9
#> 
#> $unit
#> [1] "micromol/L"
#> 
#> $method
#> [1] "brooks"
#> 
calc_creat(sex = "male", age = c(10, 17, 60))
#> $value
#> [1] 43.6 74.5 84.0
#> 
#> $unit
#> [1] "micromol/L"
#> 
#> $method
#> [1] "johanssen"
#>