How many stages are there with kidney problems and what are the facts concerning them?

The National Kidney Foundation has proposed 5 Stages of chronic kidney disease (CKD) based on a basic measurement of kidney function known as the glomerular filtration rate (GFR). We adopted a series of formulas for estimating the GFR (eGFR) that allow the calculation of an eGFR using the serum creatinine and other measurements of blood chemicals to estimate an eGFR which roughly correlates to a percentage kidney function. In order to qualify as CKD, the abnormal kidney findings must be present for at least 3 months. Stage 1 CKD is an eGFR greater than 90 milliliters per minute per 1.73 meters squared and evidence of kidney damage such as abnormal x-rays or abnormal findings in the urine. Stage 2 CKD is an eGFR between 60 and 89 with evidence of kidney damage. Stage 3 CKD is an eGFR of 30 to 59 and does not require evidence of kidney damage. Stage 4 CKD is an eGFR between 15 and 29. Stage 5 CKD is an eGFR of less than 15.

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