If clearance of a drug equals the CFR, it implies that: (A) Drug is reabsorbed in renal tubules, (B) Drug is secreted into renal tubules, (C) Drug is neither secreted or reabsorbed in renal tubules, (D) None of the above
Answer is B. Clearance = GFR, If there is no secretion or reabsorption in renal tubules.
Clearance > GFR, there is net tubular secretion.
Clearance < GFR, there is net tubular reabsoption.