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Kidney Function (GFR) Calculator
Race
Sex (gender)
Age in Years
Creatinine Level mg/dL
* Estimated GFR
(mL/min/1.73 m2)
*This GFR calculation is only an estimate of kidney function.
Other factors are often needed to make an accurate assessment.
Making an estimate of glomerular filtrate rate (GFR) is important when a patient has a minimal elevation in serum creatinine or is at risk for chronic kidney disease (CKD). The above GFR calculator uses the most commonly employed estimating equation. Other estimating equations have been developed and should be considered, especially in patients whose GFR is close to 60 mL/min/1.73m2, when a diagnosis of CKD is uncertain, or when the serum creatinine calibration is traceable to an isotope dilution mass spectrometry (IDMS) standard (see www.nkdep.nih.gov).

When a patient has a sustained GFR under 60 mL/min/1.73m2, the table below can be used to classify the patient into a CKD stage and to estimate the severity of their disease. When a patient has a reduced GFR, many drugs should be avoided or require dose modification. Several common references exist to inform providers on drug modifications in CKD (see http://www.nkdep.nih.gov/professionals/drug-dosing-information.htm).

  • Levey et al, A simplified equation to predict glomerular filtration rate from serum creatinine, J Am Soc Nephrol: 2000 (111), 155A
  • Levey AS, Coresh J, Greene T, et al. Using standardized serum creatinine values in the modification of diet in renal disease study equation for estimating glomerular filtration rate. Ann Intern Med. 2006; 145:247-54.
  • Stevens LA, Nolin T, Richardson M, et al. Comparison of Drug Dosing Recommendations Based on Measured GFR and Kidney Function Estimating Equations. Am J Kid Dis. 2009; 54 (1):33-42
 
Diagram provided by the National Kidney Disease Education Program (NKDEP).




Last Updated - May 08 2017 15:25:51.

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