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Pediatric eGFR Calculator (Schwartz)

· Last updated：2026-08-05

This tool is for informational purposes only and does not constitute medical, financial, or legal advice; consult a qualified professional for advice.

Estimate glomerular filtration rate (eGFR) in children (1–18 y) with the Schwartz formula. 2009 Bedside version (recommended, IDMS-traceable creatinine): eGFR = 0.413 × Height(cm) / SCr(mg/dL). 1984 Original version (legacy, pre-IDMS assays): eGFR = 0.55 × Height(cm) / SCr(mg/dL). The coefficient dropped from 0.55 to 0.413 because IDMS-standardized assays return lower creatinine values. Returns a BSA-INDEXED eGFR in mL/min/1.73 m². Derived from Schwartz GJ et al., Am J Kidney Dis 2009 (0.413) and Pediatrics 1976 (0.55). Valid for pediatric stable renal function; use CKD-EPI/MDRD for adults, not for neonates/AKI. Not medical advice.

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Tool usage guide

Learn when to use this tool, what it supports, and how real users apply it.

Key facts

Category
Health
Input types
number, select
Output type
json
Sample coverage
4
API ready
Yes

Overview

The Pediatric eGFR Calculator estimates glomerular filtration rate in children aged 1–18 years using the Schwartz formula. Enter height in centimeters and serum creatinine in mg/dL, then choose the 2009 Bedside equation or the legacy 1984 Original version to receive a BSA-indexed result in mL/min/1.73 m².

When to use

  • Estimate eGFR for a child or adolescent with stable renal function.
  • Use the 2009 Bedside Schwartz equation when creatinine is IDMS-standardized.
  • Compare the legacy 1984 result when working with non-IDMS creatinine assays or historical records.

How it works

  1. 1Enter the patient's height in centimeters and serum creatinine in mg/dL.
  2. 2Select the equation version: 2009 Bedside uses a coefficient of 0.413, while 1984 Original uses 0.55.
  3. 3The calculator divides the selected coefficient multiplied by height by serum creatinine.
  4. 4The JSON result reports eGFR in mL/min/1.73 m² together with the selected method and coefficient.

Use cases

  • Pediatric nephrology assessment using height and laboratory serum creatinine.
  • Reviewing how IDMS-standardized creatinine changes the estimated eGFR compared with the legacy coefficient.
  • Documenting a reproducible eGFR calculation with the selected Schwartz equation and precision.

Examples

1. 2009 Bedside estimate for a child

Pediatric clinician

Background

A child has a height of 110 cm and serum creatinine of 0.8 mg/dL from an IDMS-traceable assay.

Problem

Calculate a pediatric eGFR using the recommended 2009 Bedside Schwartz equation.

How to use

Enter height 110, serum creatinine 0.8, select 2009 Bedside, and set decimal places to 4.

{"height":110,"serumCreatinine":0.8,"version":"bedside-2009","decimalPlaces":4}

Outcome

The calculator returns 56.7875 mL/min/1.73 m² using eGFR = 0.413 × 110 / 0.8.

2. Compare legacy and IDMS-based equations

Clinical data reviewer

Background

A historical pediatric record uses a non-IDMS creatinine assay, so the legacy Schwartz equation needs to be reviewed alongside the modern estimate.

Problem

Show the difference between the 1984 Original and 2009 Bedside coefficients for the same measurements.

How to use

Calculate the result with height 110 cm and serum creatinine 0.8 mg/dL using each equation version.

FAQ

What formula does the calculator use?

It uses either the 2009 Bedside Schwartz formula, eGFR = 0.413 × height / serum creatinine, or the 1984 Original formula, eGFR = 0.55 × height / serum creatinine.

Which equation version should I select?

The 2009 Bedside version is recommended for IDMS-traceable creatinine. The 1984 version is a legacy option for pre-IDMS assays.

What units are required?

Enter height in centimeters and serum creatinine in mg/dL. The result is reported in mL/min/1.73 m².

Can this calculator be used for adults or neonates?

No. It is intended for children aged 1–18 years and is not intended for neonates. Adult calculations should use an appropriate adult equation such as CKD-EPI or MDRD.

Is the result medical advice?

No. The estimate is for calculation and reference only and should be interpreted by a qualified healthcare professional.

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Renal Function, Dialysis, and Dose-Model Checks

Compare kidney-function formulas, dialysis adequacy metrics, and renal medication math in an educational workflow that avoids patient-specific dosing or diagnosis.

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{"height":110,"serumCreatinine":0.8,"version":"original-1984","decimalPlaces":4}

Outcome

The 1984 Original calculation returns 75.6250 mL/min/1.73 m², compared with 56.7875 mL/min/1.73 m² from the 2009 Bedside equation.