The Kidney Walk is the nation's largest walk to fight kidney disease. Held in nearly 100 communities, the event raises awareness and funds lifesaving programs that educate and support patients, their families and those at risk.
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All GFR estimating formulas on this site are designed for use with standardized creatinine and standardized cystatin C values.
Standardized creatinine values are traceable to isotope dilution mass spectrometry (IDMS).
Standardized cystatin C values are traceable to the International Federation of Clinical Chemistry and Laboratory Medicine (IFCC)/Institute for Reference Materials and Measurements (IRMM) working group.
Your laboratory can confirm whether or not it uses standardized creatinine values traceable to IDMS, and standardized cystatin C values traceable to IFCC and IRMM.
All laboratories in the US and other countries should be using standardized creatinine and cystatin methods. To properly estimate GFR, the serum creatinine and cystatin C must be measured accurately. Consequently, the calculators for older, non-standardized methods of calculating GFR in adults are no longer available on this website.