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Catecholamine Blood Test
A catecholamine blood test measures the amount of three hormones in your body. Find out what the test measures and what the results mean.

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What are catecholamines?

“Catecholamines” is a term for these hormones that naturally occur in your body:

  • dopamine
  • norepinephrine
  • epinephrine

Your body produces more catecholamines during times of stress. Catecholamines prepare your body for stress by making your heart beat faster and raising your blood pressure.

What is the purpose of the catecholamine blood test?

The catecholamine blood test determines whether the level of catecholamines in your blood is too high.

Most likely, your doctor has ordered a catecholamine blood test because they’re concerned that you might have a pheochromocytoma. This is a tumor that grows on your adrenal gland, where catecholamines are released. Most pheochromocytomas are benign, but it’s important to remove them so they don’t interfere with regular adrenal function.

Your child and the catecholamine blood test

Your child’s doctor may order a catecholamine blood test for your if they’re concerned your child has neuroblastoma, which is a common childhood cancer. According to the National Cancer Institute, 14 percent of cancers in children below the age of 5 are neuroblastomas. The sooner a child is diagnosed with neuroblastoma and begins treatment, the better their outlook.

What symptoms might make my doctor order a catecholamine blood test?

Symptoms of pheochromocytoma

The symptoms of a pheochromocytoma, or adrenal tumor, are:

  • high blood pressure
  • rapid heartbeat
  • an unusually hard heartbeat
  • heavy sweating
  • severe headaches off and on for an extended period
  • pale skin
  • unexplained weight loss
  • feeling unusually frightened for no reason
  • feeling strong, unexplained anxiety

Symptoms of neuroblastoma

The symptoms of neuroblastoma are:

  • painless lumps of tissue under the skin
  • abdominal pain
  • chest pain
  • back pain
  • bone pain
  • swelling of the legs
  • wheezing
  • high blood pressure
  • rapid heartbeat
  • diarrhea
  • bulging eyeballs
  • dark areas around the eyes
  • any changes to the shape or size of eyes, including changes to pupil size
  • a fever
  • unexplained weight loss

How to prepare and what to expect

Your doctor may tell you not to eat or drink anything for six to 12 hours before the test. Follow your doctor’s orders carefully. Your test results could be incorrect if you don’t.

A healthcare provider will take a small sample of blood from your veins. They’ll probably ask you to remain quietly seated or to lie down for as long as half an hour before your test.

A healthcare provider will tie a tourniquet around your upper arm and look for a vein large enough to insert a small needle. When they’ve located the vein, they’ll clean the area around it to make sure they don’t introduce germs into your bloodstream. Next, they’ll insert a needle connected to a small vial. They’ll collect your blood in the vial. This could sting a little. They’ll send the collected blood to a diagnostic lab for an accurate reading.

Sometimes, the healthcare provider taking your blood sample will access one of the veins on the back of your hand instead of inside of your elbow.

What might interfere with your test results?

A number of common medications, foods, and beverages can interfere with catecholamine blood test results. Coffee, tea, and chocolate are examples of things you might have recently consumed that make your catecholamine levels rise. Over-the-counter (OTC) medications, such as allergy medicine, could also interfere with the reading. Your doctor should give you a list of things to avoid before your test. Make sure to tell your doctor all of the prescription and OTC medicines you’re taking.

Since even small amounts of stress affect catecholamine levels in the blood, some people’s levels may rise just because they’re nervous about having a blood test.

If you’re a breast-feeding mother, you may also want to check with your doctor about your intake before your child’s catecholamine blood test.

What are the possible outcomes?

Because catecholamines are related to even small amounts of stress, the level of catecholamines in your body changes based on whether you’re standing, sitting, or supine, which means lying down.

A picogram is one-trillionth of a gram. The Mayo Clinic lists the following normal adult levels of catecholamines:

  • norepinephrine
  • supine: 70-750 picograms/ milliliter (pg/mL)
  • standing: 200-1,700 pg/mL
  • epinephrine
  • supine: undetectable up to 110 pg/mL
  • standing: undetectable up to 140 pg/mL
  • dopamine
  • less than 30 pg/mL with no postural change

Children’s levels of catecholamines vary dramatically and change by the month in some cases because of their rapid growth. Your child’s doctor will know what the healthy level is for your child.

High levels of catecholamines in adults or children can indicate the presence of a neuroblastoma or a pheochromocytoma. Further testing will be necessary.

What are the next steps?

Your test results should be ready in a couple of days. Your doctor will read them and you can both discuss your next steps.

The catecholamine blood test isn’t a definitive test for a pheochromocytoma, neuroblastoma, or any other condition. It helps your doctor narrow down the list of conditions that could be causing your symptoms. More testing will need to be done, including possibly a catecholamine urine test. 

Written by: Elea Carey
Edited by:
Medically Reviewed by: [Ljava.lang.Object;@10e0c11c
Published By: Healthline Networks, Inc.
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