Allergy Diagnosis: Blood Tests
Skin testing is the most sensitive and least costly way to identify
allergies. People with widespread skin conditions like eczema, however, should not be tested using this method.
There are other diagnostic tests that use a blood sample to detect levels of IgE antibody to a particular allergen. One such blood test is called the radioallergosorbent test (RAST), which can be performed when eczema is present or if a person has taken medicines that interfere with skin testing.
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