<prompt> Answer this question truthfullyWhat are the laboratory results for Pheochromocytoma?  <response>: <reason> An elevated concentration of the following is diagnostic of pheochromocytoma.Elevated 24-hour urine fractionated metanephrines and catecholamines. The cutoff values are: Normetanephrine 900 mcg24 hours Metanephrine 400 mcg24 hours Norepinephrine 170 mcg24 hours Epinephrine 35 mcg24 hours Dopamine 700 mcg24 hours Elevated plasma fractionated metanephrines. The cutoff values are: Metanephrine 0.3-0.5 nmolL Normetanephrine 0.66- 0.9 nmolL Elevated urinary vanillyl mandelic acid The following drugs interfere with urinary catecholamines metabolism and shoudl be discontinued two weeks before any hormonal assessments: Tricyclic antidepressants TCAs Levodopa Antipsychotics Ethanol Acetaminophen Phenoxybenzamine Patients with spells of elevated blood pressure sudden onset of a symptom or symptoms can be negative in-between spells and should be tested directly after the attacks. 