5-hydroxyindoleacetic acid

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5-hydroxyindoleacetic acid (5-HIAA) (hy-droks-i-in-dohl-ă-see-tik) n. a metabolite of serotonin, the most common secretion product of carcinoid tumours. Measured over 24 hours in the urine, this is the most reliable screening test for such tumours.

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