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Catecholamines (Urine)Catecolaminas (en orina)

Catecholamines (Urine)

Does this test have other names?

urine metanephrines, epinephrine, norepinephrine, dopamine 

What is this test?

This test measures the levels of catecholamines in your urine.

Catecholamines are hormones made by your adrenal glands. They are released when you have physical or emotional stress. These hormones include epinephrine and dopamine. They do many things in your body. They send nerve impulses in your brain, narrow blood vessels, and raise your heart rate.

People who have a rare type of tumor called a pheochromocytoma have high levels of catecholamines in their urine. These tumors cause high blood pressure. The high blood pressure usually goes away if the tumor is taken out. About 95% of these tumors are found in the belly (abdomen).

Why do I need this test?

You may need this test if your healthcare provider thinks you have a pheochromocytoma tumor.  Signs and symptoms may include:

  • Headaches can keep coming back

  • Sweating

  • High blood pressure

Not everyone with this type of tumor has high blood pressure. Up to 15% of people with this type of tumor have normal blood pressure.

Other symptoms include heart palpitations, weakness, and symptoms similar to those of a panic attack. Less common symptoms include blurry vision and weight loss.

You might also have this test if you have high blood pressure that doesn't get better with other treatment.

What other tests might I have along with this test?

Your healthcare provider may also order other tests, including:

  • Blood tests

  • CT or MRI scan

  • MIBG scintigraphy

What do my test results mean?

Many things may affect your lab test results. These include the method each lab uses to do the test. Even if your test results are different from the normal value, you may not have a problem. To learn what the results mean for you, talk with your health care provider.

Results are given in micrograms per 24 hours (mcg/24 hour). Normal results are:

  • Norepinephrine: less than 170 mcg/24 hour

  • Epinephrine: less than 35 mcg/24 hour

  • Dopamine: less than 700 mcg/24 hour

  • Normetanephrine: less than 900 mcg/24 hour, or metanephrine: less than 400 mcg/24 hour

Higher levels of these hormones may mean you have a pheochromocytoma tumor.

How is this test done?

This test requires a 24-hour urine sample. For this type of sample, you must collect all the urine you make for 24 hours. Empty your bladder completely first thing in the morning without collecting it and note the time. Then collect your urine every time you go to the bathroom for the next 24 hours.

Does this test pose any risks?

The test poses no known risks.

What might affect my test results?

Certain medicines can affect your results. These include tricyclic antidepressants and cold and allergy medicines.

These foods can also affect your results:

  • Coffee, including decaffeinated coffee

  • Tea

  • Chocolate

  • Vanilla, including foods and beverages that contain vanilla

  • Bananas

  • Oranges and other citrus fruits

  • Walnuts

  • Avocados

  • Fava beans

  • Cheese

  • Beer and red wine

  • Licorice 

Having your period on the day of the test can also affect your results.

How do I get ready for this test?

Your healthcare provider may ask you to stop taking tricyclic antidepressant medicine at least 2 weeks before the test. Never suddenly stop your medicines before talking with your healthcare provider. He or she may recommend a gradual decrease in the amount of medicine your take.

You should avoid the foods listed in the above section before and during the test. Try to avoid stressful situations, vigorous exercise, and getting cold before the test. Don't use tobacco before the test. If you have your period on the day of the test, tell the lab person doing the collection.

In addition, be sure your healthcare provider knows about all other medicines, herbs, vitamins, and supplements you are taking. This includes medicines that don't need a prescription and any illicit drugs you may use.