5-HIAA is a urine test that measures the amount of 5-hydroxyindoleacetic acid (5-HIAA) -- a breakdown product of a hormone called serotonin.
This test tells how much 5-HIAA the body is producing.
HIAA; 5-hydroxyindole acetic acid; Serotonin metabolite
A 24-hour urine sample is needed.
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