I am trying to understand the way CKD is staged but it is confusing. eGFR of 60 and above is set as the normal level but kidney function also declines with age at about 1% a year. So individuals with a eGFR of 65-70 are called normal. But due to aging decline does this mean that in 5-10 years their eGFR will fall below 60 and will then be classified as having CKD? How is it possible to go from normal to stage 3 of a disease?

The Stages of chronic kidney disease require two pieces of information. What is the the estimated glomerular filtration rate (eGFR)?  And what is the urine testing that includes blood, protein and infection in the urine? These two pieces of information are used to classify CKD. If the eGFR is greater than 90 milliliters per minute per 1.73 meters squared and the urine is normal, then there is no CKD present. If the eGFR is greater than 90 and the urine testing is abnormal (and continues to be abnormal for greater than 3 months), then Stage 1 CKD is present. If the eGFR is between 60 and 89 and the urine is abnormal for more than 3 months, then this is Stage 2 CKD. If the eGFR is less than 60 for more than 3 months, then it does not matter what the urine shows, and this is designated Stage 3 CKD. The eGFR, on average, declines by 1% per year after age 40, so that it is possible for aging alone to result in eGFR less than 60, but most of us do not feel that aging alone should result in a diagnosis of CKD. For further information about the Staging of CKD, you can visit our web site at:  https://www.kidney.org/professionals/explore-your-knowledge/what-is-the-criteria-for-ckd

And for classification of CKD, visit our web site at:  https://www.kidney.org/professionals/explore-your-knowledge/how-to-classify-ckd

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