This test finds out how much 5-hydroxyindoleacetic acid (5-HIAA) is in your urine.
Your liver breaks down the hormone serotonin into 5-HIAA. This waste product is normally sent from your body in your urine. Tumors called functioning carcinoids secrete serotonin. Carcinoid tumors are found in the intestinal tract, lungs, appendix, and other body tissues. Because serotonin in the blood is broken down very quickly, the amount of 5-hydroxyindoleacetic acid collected in the urine over a full day more accurately reflects the rate at which serotonin is being made than the blood level at one particular time.
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