calculate_ecv: Estimate Extracellular Volume

In JMLuther/tabletools: Helpful Tools to Make html Tables

Estimate Extracellular Volume

Description

Calculates estimated extracellular volume based on available population-based regression equations (age, height, weight, sex). Formula described in Faucon et al. KI Rep. 2022. Comparison of different formulas suggests that the new formula provides more accurate results. The "Granerus" equations have been used previously in calculating single-sample iothalamate GFR and so this method is also available.

Usage

calculate_ecv(
  age,
  height,
  weight,
  sex,
  weight_units = "kg",
  height_units = "cm",
  method = "Faucon"
)

Arguments

age	Age in years
height	Height (cm)
weight	Weight (kg)
sex	Sex (M/F)
weight_units	Weight units if not in cm
height_units	Height units if not in kg
method	ECV Formula (default = "Faucon"; also can use "Granerus")

Value

single value of ECV estimate in mL

Examples

calculate_ecv(age=85, sex = "m", height = 187, weight=85)
calculate_ecv(age=85, sex = "m", height = 187, weight=85, method="Granerus")
calculate_ecv(age=85, sex = "f", height = 187, weight=85, method="Granerus")
n=5
df_test <-
  tibble(age=rnorm(n,50),
         height_cm=rnorm(n,167),
         height_m=rnorm(n,1.67),
         weight_kg=rnorm(n,80),
         sex=c(sample(c("M","F"), n, replace = T))
  )
df_test |> 
  mutate(calculate_ecv(age=age, 
                       height=height_cm,
                       weight=weight_kg,
                       sex=sex))

JMLuther/tabletools documentation built on April 14, 2025, 3:09 a.m.