(5 HIAA) 5 HYDROXY INDOLE ACETIC ACID

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What is this Test About?
5-HIAA is a major metabolite of Serotonin excreted in urine. Normally 1-3% of dietary Tryptophan is metabolized to serotonin but in patients with Intestinal Carcinoid syndrome, as much as 60% Tryptophan is converted to Serotonin.
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