5-Hydroxy-indol acetic acid

Name
5-Hydroxy-indol acetic acid
This definition applies to
All SEER websites where this term appears
Definition
5-HIAA is a urine test that measures the amount of 5-hydroxyindoleacetic acid (5-HIAA), a breakdown product of a hormone called serotonin. Levels above 15 mg/24 hour indicate malignant carcinoid tumors (argentaffinomas).

Argentaffinomas may also appear in the stomach, appendix, or lower intestine.
Resource
Title: National Cancer Institute
NCI Dictionary of Cancer Terms

Alternate Names
5-HIAA
Abstractor Notes
None
Histology
None
Primary Sites
None