A skin or blood test can tell you what
allergen, may trigger an
Skin tests work by exposing a person
to suspected allergens and seeing if a reaction occurs. The results of the skin
tests will be available immediately after testing is done.
Allergy skin tests
No raised red areas (called wheals) are created by the
A wheal created by the allergen is at least 1/8 inch
(3 mm) larger than the reaction to the negative control. The larger the wheal,
the more certain it is that the person is allergic to that specific allergen.
Allergy blood tests look for
substances in the blood called antibodies. Results of allergy blood tests are
usually available in about 7 days.
Allergy blood tests
The levels of immunoglobulin E (IgE), a type of
antibody, are the same as in a person who does not
The levels of immunoglobulin E (IgE) antibodies for a
particular allergen or group of allergens are 4 times the normal level.
E. Gregory Thompson, MD - Internal Medicine
Rohit K Katial, MD - Allergy and Immunology
June 30, 2011
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