What is the 24-Hour Urine 5-HIAA Test?
5-HIAA is a breakdown product of serotonin, a neurotransmitter involved in many bodily functions. Elevated levels of 5-HIAA in a 24-hour urine collection are a key indicator of carcinoid tumors, which often secrete excess serotonin. Measuring 5-HIAA over a full day provides an accurate picture of serotonin production in the body, aiding diagnosis...
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