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CKD Staging Explained: The Five KDIGO GFR Categories and Three Albuminuria Grades

Chronic kidney disease is staged G1 to G5 by glomerular filtration rate (stage 3 is split into 3a and 3b) and graded A1 to A3 by albuminuria. Only when both axes are combined can risk be properly assessed.

Understanding the 5 Stages of CKD: Reading Your Lab Report as a Patient

The first time I saw 'eGFR' on my lab report, I had no idea what it meant. Here's a plain-language guide to the five stages of kidney disease and what matters at each one.