Stage 1 – Kidney Damage with Normal or High eGFR

The estimated glomerular filtration rate (eGFR) (a test that measures your level of kidney function and determines your stage of kidney disease) is equal to or greater than 90 mL/min/1.73 m².

There might be evidence of kidney damage, such as protein in the urine (albuminuria), but the overall kidney function is still considered normal or slightly high.

Stage 2 – Mildly Reduced eGFR

eGFR is between 60 and 89 mL/min/1.73 m².

Kidney function is mildly reduced, and there may be further evidence of kidney damage.

Stage 3 – Moderately Reduced eGFR

Stage 3 is divided into two sub-stages – Stage 3A in which eGFR is between 45 and 59 mL/min/1.73 m² and Stage 3B in which eGFR is between 30 and 44 mL/min/1.73 m².

Kidney function is moderately reduced, and symptoms may become more noticeable.

Stage 4 – Severely Reduced eGFR

eGFR is between 15 and 29 mL/min/1.73 m².

Kidney function is significantly impaired and the person may experience more severe symptoms and complications.

Stage 5 – Kidney Failure (End-Stage Renal Disease)

eGFR is less than 15 mL/min/1.73 m².

This is the most advanced stage of CKD, where the kidneys are no longer able to function adequately to sustain life. Dialysis or kidney transplantation is often required at this stage.