# Pediatric eGFR Calculator (Schwartz)

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.

> Canonical page: https://elysiatools.com/en/tools/schwartz-pediatric-gfr

- **Category:** Health

- **Keywords:** schwartz, pediatric gfr, egfr, child, kidney function, CKiD, IDMS, serum creatinine, nephrology, renal, pediatric

## 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.

## Inputs

- **Height (cm)** (number): Body height in cm. Must be positive.
- **Serum Creatinine (mg/dL)** (number): Serum creatinine in mg/dL. Must be positive.
- **Equation version** (select)
- **Decimal Places** (number)

## 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

- Enter the patient's height in centimeters and serum creatinine in mg/dL.
- Select the equation version: 2009 Bedside uses a coefficient of 0.413, while 1984 Original uses 0.55.
- The calculator divides the selected coefficient multiplied by height by serum creatinine.
- The 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.

## Frequently asked questions

### 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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