tính e

Glomerular filtration rate (GFR) is the best overall index of kidney function. Normal GFR varies according to lớn age, sex, and body toàn thân size, and declines with age. The National Kidney Foundation recommends using the CKD-EPI Creatinine Equation (2021) to lớn estimate GFR. More information regarding this recommendation may be found here.

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NKF and the American Society of Nephrology have convened a Task Force to lớn focus on the use of race to lớn estimate GFR. Read more about the task force here.


CKD-EPI creatinine equation (2021)
CKD-EPI creatinine-cystatin equation (2021)
CKD-EPI cystatin C equation (2012)

For persons under 18 years of age, use the pediatric GFR calculator.

Is it CKD?

Either of the following must be present for ≥3 months to lớn be CKD:

  • GFR less phàn nàn 60 ≥3 months
  • ACR ≥30 mg/g or other markers of kidney damage

Click to lớn learn more.

Equation used to lớn estimate GFR?

What is the patient’s ACR?†

Based on the information supplied:

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GFR category is:‡    see note below
ACR category is:**
CKD classification is:
Risk of progression is:
Frequency of monitoring should be:
Referral to lớn a nephrologist is:

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

† Neither the category of GFR nor the category of albuminuria alone can fully capture prognosis of CKD. Persistent and increased albuminuria has been shown to lớn be an independent risk factor for CKD progression.

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

**ACR 30-300 mg/g for > 3 months indicates CKD.

Additional Information


  • CKD-EPI Creatinine Equation (2021)
  • CKD-EPI Creatinine-Cystatin Equation (2021)
  • CKD-EPI Cystatin C Equation (2012)
  • MDRD Study Equation
  • Learn more about CKD-EPI Collaboration and estimating GFR at www.ckdepi.org.

About CKD

  • Criteria for CKD?
  • Classification of CKD?
  • Why classify CKD?
  • Explore Case Studies

CKD Risk Map

Clinician Tools

Kidney Failure Risk Equation


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