Medical Health Encyclopedia

5-HIAA

How the test will feel:

The test involves only normal urination, and there is no discomfort.

Why the test is performed:

Text Continues Below

---

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.

A.D.A.M., Inc. is accredited by URAC, also known as the American Accreditation HealthCare Commission (www.urac.org). The information provided herein should not be used during any medical emergency or for the diagnosis or treatment of any medical condition. A licensed physician should be consulted for diagnosis and treatment of any and all medical conditions. Call 911 for all medical emergencies. Links to other sites are provided for information only -- they do not constitute endorsements of those other sites. Copyright 2004 A.D.A.M., Inc. Any duplication or distribution of the information contained herein is strictly prohibited.