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Use: Plasma 5-hydroxy-indoleacetic acid (5HIAA or 5-HIAA) is a metabolite of serotonin that can be elevated as a result of carcinoid tumors/carcinoid syndrome.
Limitations: This test was developed and its performance characteristics determined by LabCorp. It has not been cleared or approved by the Food and Drug Administration.
Methodology: High-pressure liquid chromatography (HPLC)/tandem mass spectrometry
