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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  • Fasting Required: NO
  • Preferred Specimen: Plasma
  • Reference Range(s): 0.1-1.8 ng/mL
  • Patient Preparation: Avoid taking allergy causing drugs, antihistamines, oral corticosteroids and substances which block H2 receptors 24 hours prior to collection.
  • Turnaround Time: 4 Days
  • Test Code: 36586