Table 2.

Serum levels of calcitonin (Ct), procalcitonin (ProCt), and carcinoembryonic antigen (CEA) in patients with MTC and normal bowel movements

Laboratory value	Patient 1	Patient 2
Ct, ng/L	3,139	953
ProCt, ng/mL	13.8	6.7
CEA, µg/L	16.4	12.9

Reference values: Ct <10 ng/L, ProCt <0.1 ng/mL, CEA <4.6 ng/L