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, norepinephrine,
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.
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:
Rapid heart rate
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:
What do my test results mean?
Test results may vary depending on your age, gender, health history, the method used
for the test, and other things. Your test results may not mean you have a problem.
Ask your healthcare provider what your test results mean for you.
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
Higher levels of these hormones may mean you have a pheochromocytoma tumor.
How is this test done?
This test needs a 24-hour urine sample. For this sample, you must collect all of your
urine for 24 hours. Empty your bladder completely first thing in the morning without
collecting it. 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
Vanilla, including foods and beverages that contain vanilla
Oranges and other citrus fruits
Beer and red wine
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.
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.