| mdrd {transplantr} | R Documentation |
eGFR by abbreviated MDRD equation
Description
A vectorised function to calculate estimated glomerular filtration rate using the abbreviated (four variable) MDRD 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
mdrd(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 parameter for offset in years |
Details
Reference: Levey AS, Greene T, Kusek JW, et al. A simplified equation to predict glomerular filtration rate from serum creatinine. J Am Soc Nephrol 2000; 11:A0828.
Value
a numeric vector of eGFR values
Examples
mdrd(creat = 120, age = 45.2, sex = "M", ethnicity = "non-black")
mdrd(creat = 1.5, age = 64.3, sex = "F", ethnicity = "black", units = "US")