Specimen Requirements


Immunoglobulin E, (IgE)

Specimen Requirement

1 SST/0.3 mL serum. After 30 minutes of clotting, promptly centrifuge and refrigerate.



Room Temperature 14 days, Refrigerated 14 days, Frozen 30 days

Reference Range

By Report*


2 days

Clinical Use

Immunoglobulin E (IgE) is firmly bound to mast cells and only trace amounts are normally present in serum. When antigen (allergen) crosslinks two IgE molecules, the mast cell is stimulated to release histamine and other vasoactive amines. These vasoactive amines are responsible for the vascular permeability and smooth muscle contraction occurring in such allergic reactions as hay fever, asthma, urticaria, and eczema.

Test Code