Ask your doctor to order blood tests for serum calcium, ionized calcium and parathyroid hormone. If your calcium and parathyroid levels are both high, it would indicate hyperparathyroidism. When your parathyroid hormones are too high, they increase your blood calcium levels by pulling the calcium from your bones, which results in osteoporosis. Usually it's due to a benign tumor on one or more of your 4 parathyroid glands. It requires surgery to remove the gland with the tumor.