Histamine is a mediator of the allergic response. Histamine release causes itching, flushing, hives, vomiting, syncope, and even shock. In addition, some patients with gastric carcinoids may exhibit high concentrations of histamine
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- WHAT IT TESTS: Mast cell activation.
- WHY TAKE IT: Gauge mast cell activation and help diagnose mastocytosis.
- REQUIRES FAST? No.