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Catecholamines - blood

Definition:

The blood test for catecholamines checks the level of catecholamines in your blood. 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).

See also: Catecholamines - urine

Alternative Names:

Norepinephrine - blood; Epinephrine - blood; Adrenalin - blood; Dopamine - blood

How the test is performed:

Catecholamines are more often measured with a urine test than with this blood test.

Blood is drawn from a vein, usually from the inside of the elbow or the back of the hand. The puncture site is cleaned with antiseptic. An elastic band is placed around the upper arm to apply pressure and cause the vein to swell with blood.

A needle is inserted into the vein, and the blood is collected in an air-tight vial or a syringe. During the procedure, the band is removed to restore circulation. 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, the area is cleansed with antiseptic and punctured with a sharp needle or a lancet. The blood may be collected in a pipette (small glass tube), on a slide, onto a test strip, or into a small container. A bandage may be applied to the puncture site if there is any bleeding.

How to prepare for the test:

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.

How the test will feel:

Some people feel discomfort when the needle is inserted. Others may notice only a prick or stinging sensation. Afterward, there may be some throbbing.

Why the test is performed:

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.

Blood test

Blood test

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