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Pediatric GFR (bedside Schwartz)

Estimates pediatric/adolescent GFR from height and serum creatinine assayed enzymatically.

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Check the population, units and version. The result shows the formula or classification; it does not make an automatic treatment decision.

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Method · Limits of application

CKiD bedside Schwartz 2009:0.413×height/IDMS creatinine; mL/min/1.73m²; not CKiD U25

This is the 2009 bedside Schwartz equation, derived from 349 participants with chronic kidney disease in the CKiD study, whose recruitment eligibility was ages 1–16 years. Creatinine must be measured enzymatically and traceable to IDMS. The original study noted that further validation in children with higher kidney function was needed before using the formula to screen all children. The result is an estimate indexed to 1.73 m², not measured GFR, an isolated diagnosis or a medicine dose; it does not represent CKiD U25.

Conditions of use

Check the population, units, inclusion and exclusion criteria, and version in the original source. A result alone does not establish a diagnosis, discharge decision or prescription.

Documented parameters

Height · cm
Serum creatinine (enzymatic assay) · mg/dL

4/4 reference cases checked. Numerical tests are not clinical validation.

Sources and documentation

Documented formula

Transcribed from the source or a recorded revision; this is not a clinical recommendation.

eGFR (mL/min/1.73 m²) = 0.413 × height (cm) ÷ creatinine (mg/dL)

Schwartz 2009 bedside equation (bedside) derived in CKiD with enzymatically calibrated creatinine traceable to IDMS.

References

Identifier: tfg-de-schwartz

Original clinical content: Brazilian Portuguese.

Method version

CKiD bedside Schwartz 2009:0.413×height/IDMS creatinine; mL/min/1.73m²; not CKiD U25

tfg-de-schwartz@native-2026-10-03+4f0e7165c545

Source for the active edition

The bibliographic edition identifies the source. By itself, it proves neither full conformity of the formula nor clinical approval.

Synthetic cases checked (4)

Synthetic cases for checking the implementation, with no patient data.

Case 1

reference-001

Inputs

Height: 120 cm
Serum creatinine (enzymatic assay): 0.5 mg/dL

{
  "altura": 120,
  "cr": 0.5
}

Expected result

{
  "tfg": 99.12,
  "cat": "G1"
}

Actual result

{
  "tfg": 99.11999999999999,
  "cat": "G1"
}

Case 2

reference-002

Inputs

Height: 100 cm
Serum creatinine (enzymatic assay): 1 mg/dL

{
  "altura": 100,
  "cr": 1
}

Expected result

{
  "tfg": 41.3,
  "cat": "G3b"
}

Actual result

{
  "tfg": 41.3,
  "cat": "G3b"
}

Case 3

reference-003

Inputs

Height: 150 cm
Serum creatinine (enzymatic assay): 3 mg/dL

{
  "altura": 150,
  "cr": 3
}

Expected result

{
  "tfg": 20.65,
  "cat": "G4"
}

Actual result

{
  "tfg": 20.65,
  "cat": "G4"
}

Case 4

reference-004

Inputs

Height: 145.3 cm
Serum creatinine (enzymatic assay): 1 mg/dL

{
  "altura": 145.3,
  "cr": 1
}

Expected result

{
  "tfg": 60.01,
  "cat": "G2"
}

Actual result

{
  "tfg": 60.008900000000004,
  "cat": "G2"
}

Code and reproducibility

This tool’s code on GitHub

Download code and tests

Sources, version and reproduction instructions

The code tests are technical checks. Clinical approval and professional translation review are recorded separately.

Relationship with cancer research

General context — relationship to be defined

A resource for general clinical contexts. This edition does not assign a specific oncological relationship; selecting it for a study requires a justified question, population and purpose.