Table 1.

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

Laboratory value	Patient 1		Patient 2		Patient 3
	pre-op	post-op	pre-op	post-op	pre-op	post-op
Ct, ng/L ProCt, ng/mL CEA, µg/L	52,894 16.8 45.9	825 12.7 19.6	2,890 9.7 60.2	490 5.6 11.9	4,088 23.1 16.3	8.2 <0.1 2.1

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