PTH and hyperparathyroidism: The diagnosis of hyperparathyroidism is made after a blood test that shows the following: a) high levels of parathyroid hormone, b) high levels of calcium in the blood, usually with low levels of phosphorus, c) DEXA scan (bone density scan) can help diagnose bone loss, fractures, or bone softening, while X-rays, CT scans or ultrasounds may reveal calcium deposits or kidney stones [10].