Hypercalcemia may not cause any symptoms. Therefore, high calcium levels in the blood may not be detected until a doctor orders routine blood work. Once conducted, a blood test can also measure parathyroid hormone levels, which can help a doctor determine if someone has hyperparathyroidism. If hyperparathyroidism isn't the cause of hypercalcemia, additional tests can help determine the underlying cause. For instance, imaging tests can look for breast cancer, lung cancer, and sarcoidosis.

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