FENa: Calculate the Fraction of Excreted Sodium

In CCVR/inteRn: What the package does (short line)

Description

Calculate the fraction of excreted sodium to assess the type of kidney injury.

Usage

FENa(
  urine.sodium = 1,
  plasma.sodium = 1,
  urine.creatinine = 1,
  plasma.creatinine = 1
)

Arguments

urine.sodium	Numerical value. Urine sodium reported in a lab (sodium urine spots).
plasma.sodium	Numerical value. Plasma sodium reported in BMP or CMP.
urine.creatinine	Numerical value. Urine creatinine reported in a lab (creatinine urine spots).
plasma.creatinine	Numerical value. Plasma creatinine reported in BMP or CMP.

Value

Returns a percentage corresponding to the fraction of excreted sodium.

Author(s)

Carlos C Vera Recio

References

Espinel, C H. “The FENa test. Use in the differential diagnosis of acute renal failure.” JAMA vol. 236,6 (1976): 579-81. doi:10.1001/jama.236.6.579

Examples

FENa(
  urine.sodium = 1,
  plasma.sodium = 1,
  urine.creatinine = 1,
  plasma.creatinine = 1
)

## The function is currently defined as
function (
  urine.sodium = 1, 
  plasma.sodium = 1, 
  urine.creatinine = 1,
  plasma.creatinine = 1
) 
{
    FENa = 100 * ((urine.sodium * plasma.creatinine)/(plasma.sodium * 
        urine.creatinine))
    cat("Fraction of excreted sodium = ", FENa)
    cat("", sep = "\n")
    interpretation = if (FENa > 4) {
        "Post Renal"
    }
    else if (FENa >= 1 & FENa <= 4) {
        "Intrinsic Renal"
    }
    else if (FENa < 1) {
        "Pre-Renal"
    }
    res = list(`fraction of excreted sodium` = FENa, interpretation = interpretation)
    return(res)
}

CCVR/inteRn documentation built on Dec. 17, 2021, 12:51 p.m.