- Test Overview
- Why It Is Done
- How To Prepare
- How It Is Done
- How It Feels
- What Affects the Test
- What To Think About
Catecholamines in Blood
Catecholamines in Blood
A test for catecholamines measures the amount of the hormones epinephrine, norepinephrine, and dopamine in the blood. These catecholamines are made by nerve tissue , the brain, and the adrenal glands . Catecholamines help the body respond to stress or fright and prepare the body for "fight-or-flight" reactions.
The adrenal glands make large amounts of catecholamines as a reaction to stress. The main catecholamines are epinephrine (adrenaline), norepinephrine (noradrenaline), and dopamine. They break down into vanillylmandelic acid (VMA), metanephrine, and normetanephrine. Metanephrine and normetanephrine also may be measured during a catecholamine test.
Catecholamines increase heart rate, blood pressure, breathing rate, muscle strength, and mental alertness. They also lower the amount of blood going to the skin and intestines and increase blood going to the major organs, such as the brain, heart, and kidneys.
Certain rare tumours (such as a pheochromocytoma ) can increase the amount of catecholamines in the blood. This causes high blood pressure, excessive sweating, headaches, fast heartbeats (palpitations), and tremors.
Why It Is Done
A catecholamine test is done to help diagnose a tumour in the adrenal glands called a pheochromocytoma. Catecholamine levels in the blood can change quickly, so it may be hard to find high values in a single blood sample. But a special compound, metanephrine, may be found in the blood, which may mean a pheochromocytoma is present. Doctors may want to do a urine test that measures catecholamine levels over 24 hours.
How To Prepare
You may be asked to avoid the following for 2 to 3 days before having this test:
- Caffeine, such as coffee, tea, cocoa, and chocolate
- Amines. These are found in bananas, walnuts, avocados, fava beans, cheese, beer, and red wine.
- Any foods or fluids with vanilla
You may be asked to not eat or drink anything for 10 hours before this test. Do not use tobacco for 4 hours before the blood test.
Many medicines may change the results of this test. Be sure to tell your doctor about all the non-prescription and prescription medicines you take.
Your doctor may ask you to stop certain medicines, such as blood pressure medicines, before the test. Do not take cold or allergy remedies, including ASA, or non-prescription diet pills for 2 weeks before the test.
Having a blood sample taken can cause stress. This may increase catecholamine levels. Be sure to keep warm, because being cold can also increase your catecholamine levels. Ask for a blanket if you feel cold.
Talk to your doctor about any concerns you have regarding the need for the test, its risks, how it will be done, or what the results will mean. To help you understand the importance of this test, fill out the medical test information form (What is a PDF document?) .
How It Is Done
The health professional drawing your blood will:
- Wrap an elastic band around your upper arm to stop the flow of blood. This makes the veins below the band larger so it is easier to put a needle into the vein.
- Clean the needle site with alcohol.
- Put the needle into the vein. More than one needle stick may be needed.
- Attach a tube to the needle to fill it with blood.
- Remove the band from your arm when enough blood is collected.
- Put a gauze pad or cotton ball over the needle site as the needle is removed.
- Put pressure on the site and then put on a bandage.
How It Feels
The blood sample is taken from a vein in your arm. An elastic band is wrapped around your upper arm. It may feel tight. You may feel nothing at all from the needle, or you may feel a quick sting or pinch.
There is very little chance of a problem from having a blood sample taken from a vein.
- You may get a small bruise at the site. You can lower the chance of bruising by keeping pressure on the site for several minutes.
- In rare cases, the vein may become swollen after the blood sample is taken. This problem is called phlebitis. A warm compress can be used several times a day to treat this.
- Ongoing bleeding can be a problem for people with bleeding disorders. ASA, warfarin (Coumadin), and other blood-thinning medicines can make bleeding more likely. If you have bleeding or clotting problems, or if you take blood-thinning medicine, tell your doctor before your blood sample is taken.
A test for catecholamines measures the amount of epinephrine, norepinephrine, and dopamine in the blood. These catecholamines are made by nerve tissue , the brain, and the adrenal glands . The test also may measure the amounts of metanephrine and normetanephrine.
The normal values listed here—called a reference range—are just a guide. These ranges vary from lab to lab, and your lab may have a different range for what's normal. Your lab report should contain the range your lab uses. Also, your doctor will evaluate your results based on your health and other factors. This means that a value that falls outside the normal values listed here may still be normal for you or your lab.
Less than 140 pg/mL or less than 762 pmol/L
70–750 pg/mL or 381–4,083 pmol/L
200–1,700 pg/mL or 1,088–9,256 pmol/L
Sitting or lying down:
Less than 30 pg/mL or less than 163 pmol/L
Sitting or lying down:
Less than 0.50 nanomoles per litre (nmol/L)
Sitting or lying down:
Less than 0.90 nmol/L
- High levels of catecholamines, vanillylmandelic acid (VMA), or metanephrine can mean that an adrenal gland tumour ( pheochromocytoma ) or another type of tumour that makes catecholamines is present.
- Any major stress, such as burns, a whole-body infection (sepsis), illness, surgery, or traumatic injury, can cause high catecholamine levels.
- Many blood pressure medicines can also cause high catecholamine levels.
Low levels of catecholamines usually do not indicate a problem.
What Affects the Test
Reasons you may not be able to have the test or why the results may not be helpful include:
- Doing physical exercise.
- Having extreme emotional stress.
- Having surgery, injury, or illness.
- Taking certain medicines, such as ASA, nitroglycerin, tricyclic antidepressants, tetracycline, theophylline, or some blood pressure medicines.
- Using nicotine, alcohol (ethanol), or cocaine.
- Taking non-prescription cough, cold, or sinus medicines.
- Eating or drinking foods with caffeine.
What To Think About
This test is not done very often. The 24-hour urine test is better for finding high levels of catecholamines than a blood test. To learn more about a catecholamine urine test, see the topic Catecholamines in Urine.
Primary Medical Reviewer E. Gregory Thompson, MD - Internal Medicine
Donald Sproule, MDCM, CCFP - Family Medicine
Specialist Medical Reviewer Alan C. Dalkin, MD - Endocrinology
Current as ofSeptember 9, 2014
Current as of: September 9, 2014
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