What is the clearance of a substance, if its concentration in plasma in 10 mg%, concentration in urine is 100 mg% and urine flow is 2 ml/min: (A) 0.2 ml/min, (B) 0.2 ml/min, (C) 2 ml/min, (D) 20 ml/min
Answer is D. Clearance = urine flow rate ✕ urine concentration / plasma concentration
= 100 X 2 / 10
= 20 ml/min