Table 2.

CKD stages and explanations by eGFR level [16]

Stage	Description	eGFR (ML/MIN/1.73 M2)	Kidney function
S1	Possibility of kidney damage and normal kidney function	eGFR ≥ 90	90–100%
S2	Kidney damage and initial loss of kidney function	60 < eGFR < 89	60–89%
S3a	Mild and moderate loss of kidney function	45 < eGFR < 59	45–59%
S3b	Moderate and severe loss of kidney function	30 < eGFR < 44	30–44%
S4	Severe loss of kidney function	15 < eGFR < 29	15–29%
S5	Kidney failure	eGFR < 15	Less than 15%