Pediatric Calculators

CKiD SCHWARTZ AND BEDSIDE SCHWARTZ

Revised Pediatric Equations

by Stephen Z. Fadem, M.D., FACP, FASN

These equations have not been validated outside of the range of GFR of 15-75 ml/min per 1.73m2.


Cystatin C:
Creatinine:
Height:
Age: years
BUN:
Gender:

CKiD Schwartz Equation (Serum Creatinine, BUN and Cytatin C)
GFR

Bedside Schwartz Equation (Serum Creatinine)
GFR

Counahan-Barratt Equation (Serum Creatinine)
GFR
HEIGHT
CREATININE
CYSTATIN C
BUN
GENDER
AGE

NKF K/DOQI REFERENCES AND OTHER RESOURCES

(See Figure 12 for Stages of Chronic Kidney Disease)

  1. Bedside Pediatric Calculators
  2. Staples A, LeBlond R, Watkins S, Wong C, Brandt J. Validation of the revised Schwartz estimating equation in a predominantly non-CKD population. Pediatr Nephrol. 2010 Nov;25(11):2321-6
  3. Schwartz GJ, Mu´┐Żoz 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.
  4. Ronald J. Hogg, Susan Furth, Kevin V. Lemley, Ronald Portman, George J. Schwartz, Josef Coresh, Ethan Balk, Joseph Lau, Adeera Levin, Annamaria T. Kausz, Garabed Eknoyan, and Andrew S. Levey. National Kidney Foundation's Kidney Disease Outcomes Quality Initiative Clinical Practice Guidelines for Chronic Kidney Disease in Children and Adolescents: Evaluation, Classification, and Stratification Pediatrics, Jun 2003; 111: 1416 - 1421.
  5. Schwartz GJ, Haycock GB Edelmann CM Jr, Spitzer A. A simple estimate of glomerular filtration rate in children derived from body length and plasma creatinine. Pediatrics 1976;58:259-263
  6. Schwartz GJ, Feld LG, Langford DJ. A simple estimate of glomerular filtration rate in full-term infants during the first year of life. J Pediatr. 1984;104:849-854
  7. Schwartz GJ, Gauthier B. A simple estimate of glomerular filtration rate in adolescent boys. J Pediatr 1985; 106:522-526
  8. Counahan R, Chantler C, Ghazali S, Kirkwood B, Rose F, Barratt TM. Estimation of glomerular filtration rate from plasma creatinine concentration in children. Arch Dis Child. 1976;51:875-878
  9. Current Pediatric Calculator

Cockcroft-Gault Calculator (defaults to SI Units)

MDRD Calculator - Extended version

The National Kidney Foundation K/DOQI Clinical Practice Guidelines for Chronic Kidney Disease, American Journal of Kidney Disease, 39:S1,S1-S266, 2002

National Kidney Foundation K/DOQI Guidelines: http://www.kidney.org/doqi/kdoqi/toc.htm


CKiD SCHWARTZ EQUATION (Scr,BUN,Cystatin C)

GFR = 39.1*[ht/Scr].516
*[1.8/cystatin C]0.294
*[30/BUN]0.169
*[ht/1.4]0.188
*1.099(if male)

  • GFR= Glomerular filtration rate in cc/min/1.73m2
  • Ht = Height in meters
  • Cystatin C = mg/L
  • Scr = Serum creatinine = mg/dL
  • BUN = mg/dL
BEDSIDE SCHWARTZ EQUATION (CREATININE)

GFR=0.413*Ht/Scr

Ht=Height in centimeters

COUNAHAN-BARRATT EQUATION (CREATININE)

GFR=0.43*Ht/Scr

Ht=Height in centimeters


Programmed by Stephen Z. Fadem, M.D., FASN and Brian Rosenthal
© 2000 - 2010, Stephen Z. Fadem, M.D., FASN and licensed to The National Kidney Foundation. Page coding updated February 07, 2015 at 07:38 pm. All rights reserved. No part of this code can be reproduced without written permission of the author.