Table 3. Biochemical profile.

Case	Diagnosis	Cortisol 8 am	Cortisol LLDST ug/dL	Cortisol HDDST ug/dL	UFC ug/24 h!	ACTH pg/mL	Lowest potassium mEq/lt
1	Occult	68	NR	NR	3350	265	1.8
2	Metastatic medullary thyroid carcinoma	27.4	24	NR	2600	NR	2.6
3	Well-differentiated pancreatic neuroendocrine tumor	21.7	7.7	7.2*	NA	31.8	3
4	Lung carcinoid	21 24.5†	22.2 4.5†	18.42 -	NR -	NR 401.4†	NA
5	Small-cell lung carcinoma	33.66	22.6	30.61	NR	32.5	1.3
6	Lung carcinoid with liver and bone metastases.	NR	28.8	NR	3994	93.7	2.2
7	Probable small-cell lung carcinoma	NR	44.6	> 120	6963	115.9	1.7
8	Grade 3 pancreatic neuroendocrine carcinoma with liver metastasis	NR	45.9	48.5	6487	10.2	2.1
9	Lung carcinoid	34.2	32.5	28.9	283	88.3	2.8
10	Pheochromocytoma	19.4	23.8	2.1*	98	25.8	4.03
11	Poorly-differentiated lung neuroendocrine carcinoma with liver metastasis	-	58.9	-	7530	79.9	1.8
12	Grade 2 pancreatic neuroendocrine carcinoma with liver metastasis	58.7	NR	63.7	196.3	135.6	1.9
13	Metastatic thymoma	21	49	29	1478	144	2.7
14	Small-cell lung carcinoma	60	60	-	253	765	2.1

ACTH: Adrenocorticotropic hormone; UFC: 24-hour urinary free cortisol; NA: not available; NR: not realized; LLDST: low-dose dexamethasone suppression test (LDDST); HDDST: high-dose dexamethasone suppression test.

! Reference levels differ according to laboratory (HSVF 58-243 ug/24 h, HPTU 50-190 ug/24 h)

† At the time of recurrence.

* Suppression of plasma cortisol after HDDST by 50 percent of basal value.