CKD stage 3 is defined by an estimated glomerular filtration rate (eGFR) in which range?

• A. eGFR 15 to 29 mL/min/1.73 m2
• B. eGFR 30 to 59 mL/min/1.73 m2
• C. eGFR 60 to 89 mL/min/1.73 m2
• D. eGFR 5 to 14 mL/min/1.73 m2

Answer: (B)

CKD stage 3 represents a moderate drop in kidney function, shown by an eGFR in the 30 to 59 mL/min/1.73 m² range. Within this band, there are two sub-stages: 3a (roughly 45–59) and 3b (roughly 30–44), reflecting that risk and management can differ a bit within stage 3. Values higher than this (60–89) indicate stage 2 CKD, while values below (15–29) point to stage 4 CKD and more severe loss of function. Very low eGFR values (below 15) correspond to kidney failure or the need for dialysis. The other ranges in the options correspond to different levels of CKD severity, not stage 3.