Chronic kidney disease (CKD) is classified into five stages based on the glomerular filtration rate (GFR), which measures how well the kidneys filter blood. Here’s an overview of each stage
Stage 1: Normal or high GFR (≥90 mL/min)
Stage 2: Mildly reduced GFR (60-89 mL/min)
Stage 3: Moderately reduced GFR (30-59 mL/min)
Stage 4: Severely reduced GFR (15-29 mL/min)
Stage 5: End-stage renal disease (ESRD) or kidney failure (GFR <15 mL/min)