Skin or blood: When you see an allergist, they will first take a detailed history of your symptoms(runny nose, headaches, itchy eyes etc) and then examine you. Usually a simple scratch test is done(answers within 15-20 minutes)..But some will first do a blood test(aanswers within 2-4 days).
Answered 10/3/2016
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Skin or blood: Skin testing involves placing drops of extracts of pollen, animal dander, mold, dust mite & food on your arms or back. If allergic a small hive appears within 20 minutes. An alternative is rast, a blood test that detects the same allergy antibodies found with skin testing. Sometimes one test is needed to confirm the results of the other. Provocation tests are used in cases of "local" allergy.
Answered 4/5/2014
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