CKD staging is based on estimated GFR. Which statement correctly matches stage 3?

• A. Stage 3: eGFR 45–59 (3a) or 30–44 (3b)
• B. Stage 3: eGFR 60–89
• C. Stage 3: eGFR 15–29
• D. Stage 3: eGFR ≥90

Answer: (A)

Staging CKD uses the estimated glomerular filtration rate to gauge how well the kidneys are filtering. Stage 3 represents a moderate drop in function and is split into two parts: 3a with an eGFR between 45 and 59, and 3b with an eGFR between 30 and 44. The other stages map to different ranges: stage 2 is 60–89, stage 4 is 15–29, and stage 5 is less than 15 or dialysis-dependent. Therefore, the statement that aligns with stage 3 is the one describing eGFR 45–59 (3a) or 30–44 (3b). This reflects the standard thresholds used to define stage 3 and its two subcategories.