Calcium can be regarded as one of the most vital nutrient of the body and numerous body parts and all the cells use calcium to carry out various functions such as building of bones, teeth and also repairing them apart from maintaining the body health conditions on the whole. The main purpose of calcium urine test is nothing but to sort out how much calcium is passed out of the body through urine and that is the reason why this test is also known as the urinary Ca+2 test.