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A normal value is less than 10 pg/ml (picograms per milliliter).
Note: Normal ranges may differ by the laboratory of the health care provider; it is not uncommon to see different normal values for males and females. Sometimes, health care providers obtain a second (or even a third) calcitonin blood level after an intravenous (IV) infusion of calcium, especially when the health care worker suspects medullary carcinoma of the thyroid. This additional test would be necessary if the health care provider’s suspicion was very high but the baseline calcitonin value was normal.
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