Collection Notes: Patient should avoid taking antihistamines, oral corticosteroids and substances that block H2 receptors 24-hours before collection. Centrifuge specimen immediately and aliquot plasma to a plastic screw-cap vial. Hemolyzed or lipemic specimens are not acceptable. Specimen must be transported frozen.
Clinical Utility: Histamine is involved in the inflammatory response and has a central role as a mediator of itching.
Plasma EDTA (2 mL)
Ambient 24 Hours
Refrigerated 24 Hours
Frozen 7 Days
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