Catecholamines are small molecules made by nerve tissue (including the brain) and the adrenal gland.

The major catecholamines are dopamine, norepinephrine, and epinephrine. These substances break down into other compounds, which leave your body through your urine.

A urine test can be done to measure the level of catecholamines in your body.

Catecholamines can also be measured with a blood test. See also: Catecholamines - blood

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.

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 into the container or bag when you wake up in the morning. Close the container tightly. Keep it in the refrigerator or a cool place during the collection period.
• Urinate into the special container every time you use the bathroom for the next 24 hours.
• 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 frequently, and change the bag after the infant has urinated. Empty the urine from the bag into the container provided by your doctor.

Because lively infants can cause the bag to move, this procedure may take a couple of attempts. You may need extra collection bags.

When finished, label the container and return it as instructed.

Acute stress and vigorous exercise may affect the test results.

Foods that can increase urinary catecholamines include coffee, tea, bananas, chocolate, cocoa, citrus fruits, and vanilla. Avoid these foods for several days prior to the test.

Certain drugs can also affect test results. Your health care provider may tell you to stop taking certain medicines before the test. Never stop taking medicine without first talking to your doctor.

The following drugs can increase catecholamine measurements:

• Acetaminophen (Tylenol)
• Aminophylline
• Caffeine
• Chloral hydrate
• Clonidine
• Disulfiram
• Erythromycin
• Insulin
• Levodopa
• Lithium
• Methenamine
• Methyldopa
• Nicotinic acid (large doses)
• Nitroglycerin
• Quinidine
• Tetracyclines

Drugs that can decrease catecholamine measurements include:

• Clonidine
• Disulfiram
• Guanethidine
• Imipramine
• MAO inhibitors
• Phenothiazines
• Reserpine
• Salicylates

The test involves only normal urination, and there is no discomfort.