You are in Medical Library . The test is used primarily to screen for, diagnose, and monitor treatment of pheochromocytoma or neuroblastoma .
Catecholamines are chemically-similar small molecules that are derived from the amino acid tyrosine.
Norepinephrine is the primary neurotransmitter in the sympathetic nervous system and is also in the brain. Epinephrine is a neurotransmitter in the brain but is also a major hormone in the body. How The Test Is Performed Catecholamines can be measured in the blood or urine. Although the urine test is most often performed, serum catecholamines can be measured. A needle is inserted into the vein, and the blood is collected in an air-tight vial or a syringe.