Stages of chronic kidney disease for children based on the KDIGO 2012 clinical practice guideline

GFR category	GFR (mL/min/1.73 m²)	Terms
G1	≥90	Normal or high
G2	60 to 89	Mildly decreased*
G3a	45 to 59	Mildly to moderately decreased
G3b	30 to 44	Moderately to severely decreased
G4	15 to 29	Severely decreased
G5	<15	Kidney failure

In the absence of evidence of kidney damage, neither GFR category G1 nor G2 fulfill the criteria for CKD.

KDIGO: Kidney Disease: Improving Global Outcomes; GFR: glomerular filtration rate; CKD: chronic kidney disease.
* Relative to young adult level.

Reprinted with permission from: Macmillan Publishers Ltd: Kidney International Supplements. KDIGO 2012 Clinical Practice Guideline for the Evaluation and Management of Chronic Kidney Disease. Chapter 1: Definition and classification of CKD. Kidney Int Suppl 2013; 3:19. Copyright © 2013. www.nature.com/kisup.

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Stages of chronic kidney disease for children based on the KDIGO 2012 clinical practice guideline