Home › Forums › Infant Reflux Support › HELP!!! › false pos/neg with allergy testing…
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Anonymous.
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August 27, 2006 at 5:12 pm #12425
Anonymous
InactiveOkay, so I just want to hear from all you guys out there who have had allergy testing done…
My doc said the blood RAST test mostly gives false positives, and usually NOT false negatives. Therefore, when we got back Lucas’ test results and everything was negative, we breathed a sigh of relief. It seems a lot of you out there have had a different commentary from your docs? Just wondering what you’ve been told…
Also, when Lucas had the blood RAST test and celiac blood test done, he haden’t had many of the foods being tested for in his system for quite a long time (18 mos since having beef and tomato, over a year since having dairy and soy, 3 months since having gluten). Our allergist said this was fine, if he had EVER had it, that was enough. I was worried because I wasn’t about to reintroduce something just to take an allergy test. Yet, he said it was fine. I’ve also read recently that some of you have had a different commentary on this as well, can you share your stories?
This is so confusing!! Have any of you read these stances anywhere like in a medical journal or on a medical/allergy web-site?? I’m just wondering how I should feel about his test results and reintroducing foods this Sept (we agreed we would begin trialing foods in Sept “since he’s not allergic”).
Thanks for any input.
August 28, 2006 at 5:15 pm #12494Anonymous
Inactiveceliac testing isn’t real reliable at this young of an age. also, some tests for celiac are alot better than others—-do you know what tests were done to test for celiac? three months off of gluten could effect the test results.
August 28, 2006 at 9:31 pm #12508Anonymous
InactiveI’m really not much help with the false pos/neg issue. Our ped said one thing and our allergist said another. I’m leaning towards the allergist. He said that the RAST could have false negatives because it detects antibodies and it takes more exposures for them to build up. (I think that’s how he described it.) The skin test can have false positives because the skin can be overly sensitive and react when there is no real allergy. That’s why the size of the skin reaction is so important.
We were told that they had to have had gluten recently to do a celiac test, but for allergy testing they just have to have been exposed to it at some point.
August 29, 2006 at 1:40 pm #12559Anonymous
InactiveKim,
thanks for the info…inconsistant with what our allergist said! This is so frustrating!!
Christine,
I’ll have to look it up and get back to you. Thanks for the reply. Hope all is going well with your family!
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