Description
Why It’s Done
This test is typically ordered to:
• Diagnose or rule out catecholamine-secreting tumors, such as:
o Pheochromocytoma (tumor of the adrenal gland)
o Paraganglioma (tumor outside the adrenal gland)
• Investigate symptoms such as:
o High blood pressure (especially if sudden or resistant to treatment)
o Severe headaches
o Rapid heartbeat (palpitations)
o Sweating
o Anxiety or tremors
• Monitor patients with a history of catecholamine-producing tumors
Preparation
Proper preparation is essential for accurate results:
• Fasting: May be required for 8–12 hours (follow your doctor’s instructions).
• Rest: Lie down and rest quietly for 20–30 minutes before the blood draw (lab staff usually facilitate this).
• Avoid certain foods for at least 24 hours before the test, including:
o Bananas, chocolate, vanilla, citrus fruits
o Caffeinated drinks (coffee, tea, soda)
• Avoid specific medications that can interfere with results (only stop them if directed by your doctor), including:
o Decongestants
o Certain antidepressants
o Beta-blockers or stimulants
• Avoid stress and vigorous exercise for 24 hours before the test.
