AllRefer Health - 5-HIAA (5-Hydroxyindole Acetic Acid, HIAA, Serotonin Metabolite)

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5-HIAA


•	Definition
•	Why is the Test Performed?
•	How is the Test Performed?
•	How to Prepare for the Test?
•	How will the Test Feel?
•	Normal Values
•	What do Abnormal Results Mean?
•	Special Considerations
•	Risks
•	Go To Main Page

Alternate Names : 5-Hydroxyindole Acetic Acid, HIAA, Serotonin Metabolite

Definition

This is a test that measures the amount of 5-HIAA in urine.

Why is the Test Performed?

This test is performed to evaluate the amount of 5-HIAA excreted by the body.

Serotonin is synthesized from the amino acid tryptophan by hormone-producing enterochromaffin cells in the gut and bronchi (airways of the lung). Serotonin increases dilation of blood vessels and platelet aggregation (clumping of platelets). It is metabolized in the liver to 5-HIAA and eventually ends up in the urine.

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• Definition
• Why is the Test Performed?
• How is the Test Performed?
• How to Prepare for the Test?
• How will the Test Feel?
• Normal Values
• What do Abnormal Results Mean?
• Special Considerations
• Risks

Review Date : 9/14/2003
Reviewed By : Corey Cutler, M.D., M.P.H., F.R.C.P.C., Department of Medical Oncology, Dana-Farber Cancer Institute; Instructor in Medicine, Harvard University, Boston, MA. Review provided by VeriMed Healthcare Network.

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