Immunochemistry

24 Hour Urine – Serotonin (5-HIAA)

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5-hydroxyindoleacetic acid (5-HIAA) is an end-product of the trytophan metabolism and It is excreted in urine. It is formed as a result of deamination from serotonin. Serotonin, a powerful smooth muscle stimulant, is produced in large amounts by carcinoid tumors.

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