Some health practitioners continue to refer to all Ig E allergy blood tests as RAST even though it is not the exact assay that the testing laboratory uses.
Alternatively, the health practitioner may pick and choose selectively from a long list of individual allergens suspected of causing a person's allergies.
While the traditional method for blood testing was the RAST (radioallergosorbent test), it has been largely replaced with newer Ig E-specific immunoassay methods.
American Academy of Allergy Asthma and Immunology, [On-line information].
American Academy of Allergy Asthma and Immunology [On-line information].
Each allergen-specific Ig E antibody test performed is separate and very specific: honeybee versus bumblebee, egg white versus egg yolk, giant ragweed versus western ragweed.
Groupings of these tests, such as food panels or regional weed, grass, and mold panels, can be done. Immunoglobulin E (Ig E) is a class of antibody (immune protein) associated with allergic reactions. It is normally found in very small amounts in the blood. National Institute of Allergy and Infectious Diseases (1999 January, last revision). Mosby's Diagnostic and Laboratory Test Reference 8th Edition: Mosby, Inc., Saint Louis, MO. You may be able to find your test results on your laboratory's website or patient portal. You may have been directed here by your lab's website in order to provide you with background information about the test(s) you had performed.