Giant Pheochromocytoma Diagnosis Confounded by Amphetamine Use

Table 1

Summary of patients’ laboratory evaluation data during initial workup, after 1 week of drug washout period, and following surgical removal of her tumor.

	Initial	Drug washout	Postoperation day 3 (follow-up)	Normal reference range
Plasma metanephrine (nmol/L)	15	8	<0.2	<0.50 nmol/L
Plasma normetanephrine (nmol/L)	26	13	0.7	<0.9 nmol/L
Urine metanephrine (mcg/24 hr)	18850	8477	390	149–535 mcg/24 hr
Urine normetanephrine (mcg/24 hr)	11760	7584	1992	111–419 mcg/24 hr
Urine total metanephrine (mcg/24 hr)	30310	16051	2382	3–180 mcg/24 hr
24 hr urine cortisol (mcg/24 hr)	180			3.5–45 mcg/24 hr
Random serum cortisol (μg/dL)	104	35	22	2–14 μg/dL