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The RAST is a radioimmunoassay test to detect specific IgE antibodies to suspected or known allergens for the purpose of guiding a diagnosis about allergy. [10] [11] IgE is the antibody associated with Type I allergic response: for example, if a person exhibits a high level of IgE directed against pollen, the test may indicate the person is allergic to pollen (or pollen-like) proteins.
Diagnosis of allergy is most often done by reviewing a person's medical history and finding a positive result for the presence of allergen specific IgE when conducting a skin or blood test. [33] Specific IgE testing is the proven test for allergy detection; evidence does not show that indiscriminate IgE testing or testing for immunoglobulin G ...
It is characterized by recurrent "cold" staphylococcal infections (due to impaired recruitment of neutrophils), [2] unusual eczema-like skin rashes, severe lung infections that result in pneumatoceles (balloon-like lesions that may be filled with air or pus or scar tissue) and very high (> 2000 IU/mL or 4800 mcg/L) [3] concentrations of the serum antibody IgE.
Allergy blood tests measure the presence of IgE antibodies to specific foods, pollens, mites, animals, insects and other environmental factors. (IgE, short for "immunoglobulin E", is the antibody that triggers food allergy symptoms.) The doctor looks at the test results to help determine if the patient has allergies.
Another laboratory test is the blood test for IgE (immunoglobulin production), such as the radioallergosorbent test (RAST) or the more recent enzyme allergosorbent tests (EAST), implemented to detect high levels of allergen-specific IgE in response to particular allergens. Although blood tests are less accurate than the skin tests, they can be ...
Adults and children of any age can get an allergy blood test. For babies and very young children, a single needle stick for allergy blood testing is often gentler than several skin pricks. An allergy blood test is available through most laboratories. A sample of the patient's blood is sent to a laboratory for analysis, and the results are sent ...
IgE antibodies against plant/insect CCD determinants were shown to have both strict specificity and high affinity, so in principle they might be expected to lead to clinical symptoms just as habitual for anti-peptide IgE. In vitro experiments (histamine-release tests) with polyvalent glyco-allergens corroborated this view.
Serum blood tests are an important marker of disease severity and are also useful for the primary diagnosis of ABPA. When serum IgE is normal (and patients are not being treated by glucocorticoid medications), ABPA is excluded as the cause of symptoms. A raised IgE increases suspicion, though there is no universally accepted cut-off value.