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Pediatric eGFR Calculator (Serum Creatinine)

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1987 Schwartz requires a Jaffé assay, while 2009 bedside and Japanese Uemura require standardized enzymatic serum creatinine. Do not interchange assay methods or automatically select an equation from age alone.

Japanese pediatric Uemura (2014)

—mL/min/1.73m²

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Schwartz bedside (2009)

—mL/min/1.73m²

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Historical Schwartz (1987)

—mL/min/1.73m²

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Uemura reference creatinine (not a lab normal range)

— mg/dL

Displayed only when the Japanese pediatric model applies.

eGFR is an estimate. Unstable creatinine and atypical muscle mass affect its interpretation. Do not diagnose renal disease or adjust medication from this result alone.

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Equations, assay restrictions, and evidence

Japanese pediatric Uemura (2014)

For Japanese children age 2 to younger than 19 years using enzymatic creatinine, compute reference creatinine from a sex-specific fifth-order polynomial of height in metres; eGFR = 110.2 × referenceCr / measuredCr + 2.93. Reference Cr is a fitted quantity, NOT the lab normal range. The under-2 extension is not included.

Schwartz bedside (2009)

eGFR = 0.413 × height(cm) / serumCr(mg/dL), for standardized enzymatic Cr. Source studied children with chronic kidney disease aged 1–16; applicability to healthy populations is not established.

Historical Schwartz (1987)

eGFR = k × height(cm)/serumCr(mg/dL) for Jaffé creatinine only. In this implementation, k=0.55 from age 2 to younger than 12; at 12 or older, k=0.70 for boys and 0.55 for girls. The age-12 operational boundary approximates puberty and requires clinician review; under age 2 birth-related coefficients are not determined.

Hypothetical example

Male age 10, 150 cm, serum creatinine 0.60 mg/dL by enzymatic assay: Japanese Uemura eGFR 98.37 and Schwartz bedside 103.25 mL/min/1.73m²; the Jaffé 1987 equation is withheld. These assays cannot be freely converted.

Limitations and approval

Each model is independently gated by age and the laboratory assay; no automatic substitution occurs. All estimates are standardized to BSA 1.73m². Sources checked 2026-11-10.