Catecholamines are hormones produced by the adrenal glands, which are found on top of the kidneys. They are released into the blood during times of physical or emotional stress. The major catecholamines are dopamine, norepinephrine, and epinephrine (which used to be called adrenalin). This article discusses the test to check the level of catecholamines in a sample of blood. Catecholamines are more often measured with a urine test than with a blood test. See: Catecholamines - urineBlood is typically drawn from a vein, usually from the inside of the elbow or the back of the hand. The site is cleaned with germ-killing medicine (antiseptic). The health care provider wraps an elastic band around the upper arm to apply pressure to the area and make the vein swell with blood. Next, the health care provider gently inserts a needle into the vein. The blood collects into an airtight vial or tube attached to the needle. The elastic band is removed from your arm. Once the blood has been collected, the needle is removed, and the puncture site is covered to stop any bleeding. In infants or young children, a sharp tool called a lancet may be used to puncture the skin and make it bleed. The blood collects into a small glass tube called a pipette, or onto a slide or test strip. A bandage may be placed over the area if there is any bleeding. The accuracy of the test can be affected by certain foods and drugs, as well as physical activity and stress. Foods that can increase catecholamine levels include:You should avoid these foods for several days prior to the test, particularly if both blood and urine catecholamines are to be measured. You should also avoid stressful situations and vigorous exercise, which can both interfere with test results. Drugs that can increase catecholamine measurements include:Drugs that can decrease catecholamine measurements include:Never stop taking any medication without first talking to your doctor. Some people feel discomfort when the needle is inserted. Others may notice only a prick or stinging sensation. Afterward, there may be some throbbing. This test is used to diagnose or rule out a pheochromocytoma or neuroblastoma. It may also be done in patients with those conditions to determine if treatment is working. Epinephrine: 0-900 picograms/milliliter (pg/ml)Norepinephrine: 0-600 pg/mlNote: Normal value ranges may vary slightly among different laboratories. Talk to your doctor about the meaning of your specific test results. Higher-than-normal levels of blood catecholamines may suggest:Additional conditions under which the test may be performed include Shy-Drager syndrome. There is very little risk involved with having your blood taken. Veins and arteries vary in size from one patient to another and from one side of the body to the other. Taking blood from some people may be more difficult than from others. Other risks associated with having blood drawn are slight but may include:Norepinephrine - blood; Epinephrine - blood; Adrenalin - blood; Dopamine - blood