Calcitonin, Serum analysis is a laboratory test that measures the level of the hormone calcitonin in the blood. This hormone is primarily produced by the thyroid gland and plays an important role in regulating calcium levels in the body. The test is particularly used to diagnose and monitor certain thyroid cancers, such as medullary thyroid carcinoma, as well as to assess bone health. It may be requested in various clinical contexts, such as evaluating the body’s response to treatment or monitoring other conditions that affect calcium levels. Abnormal results may indicate thyroid disorders or other health issues that require further evaluation.