I was diagnosed with allergy-induced asthma about 5 years ago. I recently had a blood test for allergies. The results were negative. I've been taking antihistamines for a year or so. Is it possible my use of those antihistamines affected the results?
There are two ways to test for allergic sensitivity to aeroallergens. One is skin testing. Another is a serum-specific IgE blood test. Both can be done by a board-certified allergist. These tests often match but not always. The use of antihistamines can block the skin tests but would not block the blood tests. If it's possible that you have allergic asthma, you may want to discuss your symptoms with an allergist. You may also want to consider skin testing.
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