Your doctor will order calcium in a urine test, especially if you have symptoms and signs of a kidney stone such as severe back pain, abdominal pain, nausea and vomiting, blood in the urine, frequent urination. Also, your doctor may order calcium in urine tests if you have symptoms of a parathyroid disorder (high parathyroid hormone level) such as nausea and vomiting, loss of appetite, abdominal pain, fatigue, frequent urination, bone and joint pain.