kidney.epi (version 1.3.0)

egfr.schwartz: Calculate eGFR by Schwartz equation (for children only, both "classic" and "quadratic")

Description

Calculate eGFR by Schwartz equation (for children only, both "classic" and "quadratic")

Usage

egfr.schwartz(
  creatinine,
  age,
  sex,
  height_cm = 0,
  height_ft = 0,
  height_inch = 0,
  creatinine_units = "micromol/l",
  equation_type = "classic",
  label_sex_male = c("Male", 1),
  label_sex_female = c("Female", 0)
)

Value

numeric eGFR expressed in ml/min/1.73m².

Arguments

creatinine

Numeric vector. Serum creatinine, could be expressed in "micromol/L", "mmol/L" or "mg/dL". Units of measurement should be defined in variable creatinine_units (if not defined explicitly by user, the default value is "micromol/L").

age

Numeric vector. Age, in years. Age does not accounted in Schwartz equation, but used in the function to check whether Schwartz equation could be applied to a given patient.

sex

Vector. The value of variable refers to the parameters label_sex_male and label_sex_female. Required only in case of quadratic Schwartz equation.

height_cm

Numeric vector. Could be defined either as height_cm if is measured in cm, or as height_ft and height_inch if is measured in feet and inches. If the parameter height_cm is greater than 0, the function uses cm, otherwise - feet and inches.

height_ft

see height_cm

height_inch

see height_cm

creatinine_units

Character string. Units in which serum creatinne is expressed. Could be one of the following: "micromol/L", "mmol/L" or "mg/dL".

equation_type

Character string. Define whether to calculate eGFR either by classic Schwartz or quadratic Schwartz equation. Could be one of the following: "classic", "quadratic". If not explicitly defined by user, the default assumption is "classic".

label_sex_male

List. Label(s) for definition(s) of male sex.

label_sex_female

List. Label(s) for definition(s) of female sex.

Author

Programming: Boris Bikbov https://www.linkedin.com/in/boris-bikbov.

Details

Calculate estimated glomerular filtration rate (eGFR) by Schwartz equation.

Reference to the equation: Gao A, Cachat F, Faouzi M et al. Comparison of the glomerular filtration rate in children by the new revised Schwartz formula and a new generalized formula. Kidney International 2013;83:524–30.

Citation: Bikbov B. kidney.epi: Kidney-Related Functions for Clinical and Epidemiological Research. Scientific-Tools.Org, https://Scientific-Tools.Org. DOI: 10.32614/CRAN.package.kidney.epi

Examples

# for a single patient
egfr.schwartz (creatinine = 1.4, age = 10, height_cm = 90, sex = "Male",
  creatinine_units = "mg/dl")
egfr.schwartz (creatinine = 1.4, age = 10, height_cm = 90, sex = "Male",
  creatinine_units = "mg/dl", equation_type = "quadratic")
# for a dataset - see vignettes for details
# egfr.schwartz (creatinine = dta$scr, age = dta$age, height_cm = dta$ht,
#  sex = dta$sex, creatinine_units = "mg/dl")