NCIt related terms : 5-HYDROXYINDOLE-3-ACETIC ACID;
Alternative definition : NCI-GLOSS: A breakdown product of serotonin that is excreted in the urine. Serotonin
is a hormone found at high levels in many body tissues. Serotonin and 5HIAA are produced
in excess amounts by carcinoid tumors, and levels of these substances may be measured
in the urine to test for carcinoid tumors.;