Test for calcium, magnesium and phosphate in urine: So the test for calcium, magnesium and phosphate in urine can be done with ease by the following methods. Test for Magnesium in urine: Chemicals Required: A concentrated solution of ammonia. Urine Procedure: Take 5 ml of urine of urine in a test tube. Add 1 ml of a concentrated solution of ammonia. … [Read more...]