For this test, you must urinate into a special bag or container every time you use the bathroom for 24-hour period.
On day 1, urinate over the toilet when you wake up in the morning and discard that urine.
Urinate into the special container every time you use the bathroom for the next 24 hours. Keep it in the refrigerator or a cool place during the collection period.
On day 2, urinate into the container in the morning again when you wake up.
Label the container with your name, the date, the time of completion, and return it as instructed.
For an infant:
Thoroughly wash the area around the urethra (the hole where urine flows out). Open a urine collection bag (a plastic bag with an adhesive paper on one end).
For males, place the entire penis in the bag and attach the adhesive to the skin.
For females, place the bag over the two folds of skin on either side of the vagina (labia). Put a diaper on the baby (over the bag).
Check the infant often, and change the bag after the infant has urinated. Empty the urine from the bag into the container provided by your doctor.
Active babies can move the bag, causing the urine to go into the diaper. You may need extra collection bags.
When finished, label the container and return it as you have been told.
How to Prepare for the Test
Stress and heavy exercise may affect the test results.
Some foods can increase catacholamines in your urine. You may need to avoid the follow foods for several days before the test:
Many medicines can interfere with test results.
Your health care provider will tell you if you need to stop taking any medicines before you have this test.
Do not stop or change your medications without talking to your doctor first.
How the Test will Feel
The test involves only normal urination, and there is no discomfort.
Why the Test is Performed
The test is usually done to diagnose an adrenal gland tumor called pheochromocytoma. It may also be used to diagnose neuroblastoma. Urine catecholamine levels are increased in most persons with neuroblastoma.
The urine test for catecholamines may also be used to monitor those who are receiving treatment for these conditions.
All of the catecholamines are broken down into inactive substances that appear in the urine:
Dopamine becomes homovanillic acid (HVA)
Norepinephrine becomes normetanephrine and vanillylmandelic acid (VMA)
Epinephrine becomes metanephrine and VMA
The following normal values are the amount of the substance found in the urine over a 24-hour period:
Dopamine: 65 - 400 micrograms (mcg)/24 hours
Epinephrine: 0.5 - 20 mcg/24 hours
Metanephrine: 24 - 96 mcg/24 hours (some laboratories give the range as 140 - 785 mcg/24-hours)
Norepinephrine: 15 - 80 mcg/24 hours
Normetanephrine: 75 - 375 mcg/24 hours
Total urine catecholamines: 14 - 110 mcg/24 hours
VMA: 2 - 7 milligrams (mg)/24 hours
Normal value ranges may vary slightly among different laboratories. Talk to your doctor about the meaning of your specific test results.
The examples above show the common measurements for results for these tests. Some laboratories use different measurements or may test different specimens.
What Abnormal Results Mean
Elevated levels of urinary catecholamines may indicate:
David C. Dugdale, III, MD, Professor of Medicine, Division of General Medicine, Department of Medicine, University of Washington School of Medicine. Also reviewed by David Zieve, MD, MHA, Bethanne Black, and the A.D.A.M. Editorial team.