Catecholamines blood test

A catecholamine test is done to help diagnose a tumor in the adrenal glands called a pheochromocytoma. Catecholamine levels in the blood can change quickly, so it may be hard to find high values in a single blood sample. But a special compound, metanephrine, may be found in the blood, which may mean a pheochromocytoma is present. Doctors may want to do a urine test that measures catecholamine levels over 24 hours.

A health professional uses a needle to take a blood sample, usually from the arm. Or they may insert a small tube into your vein and have you rest for 30 minutes before the blood sample is taken.

You may be asked to avoid certain foods and fluids for 2 to 3 days before having this test, such as:

• Caffeine, such as coffee, tea, cocoa, and chocolate.
• Amines. These are found in bananas, walnuts, avocados, fava beans, cheese, beer, and red wine.
• Any foods or fluids with vanilla.
• Licorice.
• Aspirin.

You may be asked to not eat or drink anything for 10 hours before this test. Do not use tobacco for 4 hours before the blood test.

Your doctor may ask you to stop certain medicines, such as blood pressure medicines, before the test. Do not take cold or allergy remedies, including aspirin, or nonprescription diet pills for 2 weeks before the test.

Having a blood sample taken can cause stress. This may increase catecholamine levels. Be sure to keep warm, because being cold can also increase your levels. Ask for a blanket if you feel cold.

Normal

Each lab has a different range for what's normal. Your lab report should show the range that your lab uses for each test. The normal range is just a guide. Your doctor will also look at your results based on your age, health, and other factors. A value that isn't in the normal range may still be normal for you.

High values

• High levels of catecholamines, vanillylmandelic acid (VMA), or metanephrine can mean that an adrenal gland tumor (pheochromocytoma) or another type of tumor that makes catecholamines is present.
• Any major stress, such as burns, a whole-body infection (sepsis), illness, surgery, or traumatic injury, can cause high catecholamine levels.
• Many blood pressure medicines can also cause high catecholamine levels.

Low values

Low levels of catecholamines usually do not indicate a problem.