Chronic Kidney Disease (CKD) is a progressive condition where the kidneys gradually lose their function over time. The kidneys are vital organs responsible for filtering waste and excess fluids from the blood, regulating blood pressure, and producing hormones that help control various body functions.

• Stage 1: Slight kidney damage with normal or high GFR (≥ 90 mL/min).
• Stage 2: Mild reduction in GFR (60-89 mL/min).
• Stage 3: Moderate reduction in GFR (30-59 mL/min).
• Stage 4: Severe reduction in GFR (15-29 mL/min).
• Stage 5: Kidney failure (GFR < 15 mL/min), requiring dialysis or kidney transplant.