**Chronic Kidney Disease (CKD) Surveillance System**
https://nccd.cdc.gov/ckd/Calculators.aspx

This calculator returns the probability (expressed as a percentage from 0 to 100%) of having Stage 3-5 CKD, defined as an estimated glomerular filtration rate (eGFR) less than 60 mL/min/1.73m 2, based on nine input variables 1.If one or more of the values is unknown, trying different combinations of the presence or absence of the unknown characteristics will give a range of possible estimates.

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