Allergy Blood Test?

couldbeworse
Mon, 17 Oct 2011 23:11:55 +0000

Astrophysics Mom:
The blood test y’all are referring to checks for the presence of immune antibodies to various common allergens (the things we’ve developed allergies to) and there are many different assays available. In general, these in vitro tests (since they are performed out of the body) are not as useful as skin testing for diagnosing allergies. The results of these type of immunoassays are NOT effected by antihistamines, prednisone and other meds that have to be held for the skin tests and they can be performed on people with certain chronic skin diseases (sometimes skin testing can’t). There are many different “brands” and the quality and sensitivity varies. Sadly, I have known some practices where this type of testing was ordered as it sometimes gave answers but always generated income (which referral to an allergist for skin testing does not).
So clinically (despite the negative blood test), you have allergies (and do not need a psychiatrist!) and this would clearly be time for a referral for skin testing if needed but, as long as the flonase and singulair are managing your allergy symptoms, it may not be necessary. If you wanted to know specifically what you are allergic to or needed the immunotherapy shots to reduce your reactivity then evaluation by an allergist with skin testing is required.
The blood testing method is not always useless. There is growing evidence that, in kids in particular, it may be more helpful for predicting true allergies/reactivity for some specific foods.
Sorry, that was longer than planned but hopefully helpful.