Increased CT levels have been reported in Medullary Thyroid Carcinoma (MTC).4, 5, 6, 7, 8, 9, 10 Similarly, the dosage of PTH has been utilized to identify parathyroid nodules and to distinguish them from nodules of other origins located in the central neck compartment.6 Here, PTH is linked to medullary thyroid gland carcinoma.