<prompt> Serum marker of rickets is -Acid phosphatesAlkaline phoshpataseDecreased serum calciumUrinary posphates  <response>: Ans. is b i.e., Alkaline phosphataseo Amongst the given options, alkaline phosphatase is best because it is raised in all type of rickets.o The primary Basic investigations in a child of rickets are :?Serum calciumSerum phosphorusAlkaline phosphataseo If patient does not respond to calcium and Vit D therapy, secondry investigations are done :?Vit D levelSerum PTHUrinary calcium and phosphorus. 