ckid_u25_egfr: CKiD U25 eGFR Calculator (Bedside Schwartz)

In cliot: Clinical Indices and Outcomes Tools

CKiD U25 eGFR Calculator (Bedside Schwartz)

Description

Calculates the estimated Glomerular Filtration Rate (eGFR) for children and young adults (ages 1-25) using the CKiD U25 equation. This equation is mathematically identical to the "Bedside Schwartz" (2009) formula but has been validated for use in young adults up to age 25.

Usage

ckid_u25_egfr(height_cm, creatinine, creatinine_units = "mg/dL")

Arguments

height_cm	Numeric. Patient height in centimeters.
creatinine	Numeric. Serum creatinine level.
creatinine_units	String. Units for creatinine. Options: "mg/dL" (default), "micromol/L", or "umol/L".

Value

A list containing:

eGFR_mL_min_1_73m2	The estimated GFR normalized to 1.73 m^2 body surface area.
Method	Description of the formula used (k = 0.413).

References

Pierce CB, Muñoz A, Ng DK, et al. Age- and Sex-Dependent Clinical Equations to Estimate GFR in Children and Young Adults with CKD. Clin J Am Soc Nephrol. 2021;16(6):871-880. doi:10.2215/CJN.17191120 Schwartz GJ, Muñoz A, Schneider MF, et al. New equations to estimate GFR in children with CKD. J Am Soc Nephrol. 2009;20(3):629-637. doi:10.1681/ASN.2008030287

Examples

# Example 1: Child
# 120 cm, Cr 0.6 mg/dL
# eGFR = 0.413 * (120 / 0.6) = 82.6
ckid_u25_egfr(120, 0.6)

# Example 2: Young Adult (SI Units)
# 175 cm, Cr 88.4 umol/L (1.0 mg/dL)
# eGFR = 0.413 * (175 / 1.0) = 72.3
ckid_u25_egfr(175, 88.4, "umol/L")

cliot documentation built on Dec. 1, 2025, 1:06 a.m.