ckd_epi: eGFR by CKD-EPI equation

In transplantr: Audit and Research Functions for Transplantation

Description

A vectorised function to calculate estimated glomerular filtration rate using the CKD-EPI equation. By default the equation accepts serum creatinine in µmol/l but can be changed to mg/dl by setting the units parameter to "US". To allow for serial measurements over time, such as for transplant follow-up data, there is an optional offset = n parameter which increases the age value used in the equation by n years.

Usage

ckd_epi(creat, age, sex, ethnicity, units = "SI", offset = 0)

Arguments

creat	numeric vector of serum creatinine in µmol/l (or mg/dl if units = "US")
age	numeric vector of age in years (accepts integers or decimals)
sex	character vector of sex ("F" for female, "M" for male)
ethnicity	character vector of patient ethnicity, one of "black" or "non-black"
units	non-vectorised optional parameter for creatinine unit ("SI" for µmol/l (default), "US" for mg/dl)
offset	non-vectorised optional numeric parameter for offset in years

Details

Reference: Levey AS, Stevens LA, Schmid CH, et al. A new equation to estimate glomerular filtration rate. Ann Intern Med 2009; 150(9):604-612.

Value

a numeric vector of eGFR values

Examples

ckd_epi(creat = 120, age = 45.2, sex = "M", ethnicity = "non-black")
ckd_epi(creat = 1.5, age = 64.3, sex = "F", ethnicity = "black", units = "US")

Example output

[1] 62.46745
[1] 42.1421

transplantr documentation built on Feb. 28, 2020, 5:07 p.m.