What is Renal threshold of drug means ? and explain in detail?
Ans. is 'a' i.e., Drug concentration above which it appears in urine Renal Threshold The renal threshold is the concentration of a substance dissolved in the blood above which the kidneys begin to remove it into the urine. When the renal threshold of a substance is exceeded, reabsorption of the substance by the proximal convoluted tubule is incomplete; consequently, pa of the substance remains in the urine. Thus renal threshold is the Drug concentration above which it appears in urine.