Assessment

Test

Normal Result

Abnormality with

Condition Explanation

Computed tomography (CT) scan or magnetic resonance imaging (MRI)

Free urine catecholamines, vanillylmandelic acid (VMA) and metanephrines (24 hr)

Epinephrine: 0-15 |jg; norepinephrine: 0-100 |g; VMA: <7 |g/mg; metanephrines: <1mg/day

Normal adrenal structure Location and size Identifies tumor of tumor and metastases

Elevated

Elevated amount of catecholamines are excreted in the urine

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726 Pheochromocytoma

Diagnostic Highlights (continued)

Test

Normal Result

Abnormality with Condition

Explanation

Plasma catecholamine

Epinephrine: 0-110 pg/mL;

Increased

Tumor releases epi

levels and fractionated

norepinephrine: 70-750

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