How it works: Generate Traditional Schwartz Equation (1976) and Modified Bedside Schwartz Equation (2009)

Formulas Used for eGFR Calculation

1. Traditional 1976 Schwartz Equation
eGFR = (K x Height (cm)) / Serum Creatinine (mg/dL)
whereas K is selected based on age and gender (as per the criteria below).

Age Categories and Corresponding K-Values
The Schwartz formula uses a proportionality constant (K) that varies based on the patient’s age and gender:
Adolescent Female (>13 years): K=0.55
Premature Infant (0 years or <1 year old): K=0.33
Term Infant (1–52 weeks): K=0.45
Children (1–13 years): K=0.55
Adolescent Male (>13 years): K=0.70


2. Bedside Schwartz Equation (2009) – Modified for Clinical Use
eGFR = (0.413 * Height (cm)) / Serum Creatinine (mg/dL)
This version was developed to improve accuracy in children with chronic kidney disease (CKD).

References:
Schwartz GJ, Brion LP, Spitzer A. The use of plasma creatinine concentration for estimating glomerular filtration rate in infants, children, and adolescents. Pediatr Clin North Am. 1987 Jun;34(3):571-90. doi: 10.1016/s0031-3955(16)36251-4. PMID: 3588043.

Schwartz GJ, Muñoz A, Schneider MF, Mak RH, Kaskel F, Warady BA, Furth SL. New equations to estimate GFR in children with CKD. J Am Soc Nephrol. 2009 Mar;20(3):629-37. doi: 10.1681/ASN.2008030287. Epub 2009 Jan 21. PMID: 19158356; PMCID: PMC2653687.

Disclaimer:
This tool is provided by GuideRPH for informational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment. All calculations should be independently verified, and clinical decisions should be based on professional judgment, official guidelines, and the individual patient’s needs. GuideRPH assumes no responsibility or liability for any errors, inaccuracies, or outcomes resulting from the use of this tool. By using this tool, you acknowledge and agree that it is to be used as a reference only and that you are solely responsible for any clinical decisions you make. This tool may not reflect the latest medical research or standards, and the user is responsible for consulting up-to-date sources.