A substance that is broken down (metabolized) from serotonin. A high level of 5-HIAA in a 24-hour urine test sample can be used to confirm whether a person’s symptoms, such as flushing of the skin (particularly the face) and diarrhea, are due to carcinoid syndrome. 5-HIAA also can be done by blood known as the 5-HIAA Serum.
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