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The allergen-specific antibody (IgE &/or IgG) test (also known as RAST, Radioallergosorbent Test) is a blood test used to screen for an allergy to a specific substance.

Allergy skin reactions include hives, eczema and dermatitis. This is especially useful if symptoms are recurrent and appear to be tied to triggers, such as exposures to particular foods or environments, and if other family members are known to have allergies.

Sometimes your doctor may recommend other blood tests if indicated.