To protect the body from this perceived threat, or allergen, the immune system of an allergic person produces antibodies called immunoglobulin E.
In some cases, the test may also be used to monitor the effectiveness of allergy treatments, or to see if a child has outgrown an allergy.
Risks The allergen-specific IgE test is considered a safe procedure.
If the blood is being drawn from a vein, the skin surface is cleaned with antiseptic, and an elastic band tourniquet is placed around the upper arm to apply pressure and cause the veins to swell with blood.
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Getting the Results The blood sample will be processed by a machine, and the results are usually available within a few days.