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5-HIAA

Alternative Names: HIAA; 5-hydroxyindole acetic acid; Serotonin metabolite Normal Values: The normal range is 3 to 15 mg/24 hr (milligrams per 24 hours) What abnormal results mean: Text Continues Below 5-HIAA levels are usually measured to detect carcinoid tumors and follow the clinical course of patients, and to diagnose certain medical conditions such as systemic mastocytosis and endocrine tumors.

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