What is the CKD stage 3 eGFR range?

• A. 15-29 mL/min/1.73 m².
• B. 60-89 mL/min/1.73 m².
• C. 30-59 mL/min/1.73 m².
• D. 90-120 mL/min/1.73 m².

Answer: (C)

CKD staging uses eGFR to gauge how well the kidneys are filtering. Stage 3 signifies a moderate drop in kidney function, with an eGFR in the range of 30 to 59 mL/min/1.73 m². This places it between stage 2 (milder decline, 60–89) and stage 4 (more severe decline, 15–29). In some guidelines, stage 3 is further split into 3a (45–59) and 3b (30–44) to reflect finer differences in risk and management. The eGFR is an estimate based on serum creatinine, along with age, sex, and race, so this range captures a meaningful, moderate reduction in kidney filtration. Other ranges correspond to different stages: higher values indicate stage 2 or normal function, and lower values indicate stage 4 or stage 5.