CALCA and medullary thyroid gland carcinoma: Both calcitonin and ProCT median values were significantly higher in active (94 pmol/L and 1.17 ng/mL) than inactive (0.28 pmol/L ng/mL and 0.06 ng/mL), benign (0.37 pmol/L and 0.06 ng/mL), and malignant non-MTC diseases (0.28 pmol/L and 0.06 ng/mL), respectively.