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 Post subject: RAST testing
PostPosted: Wed Feb 22, 2006 6:56 pm 

Joined: Tue Mar 22, 2005 6:53 pm
Posts: 1454
Location: Canada
This post is in response to a post in another thread on milk allergies, but I didn't want to take that thread too far off course so I'm starting another one.

Daisy wrote:

The RAST testing (bloodwork) helps to identify certain allergens, and may have false-negatives, but not usually false positives.

I did not know that. That's very helpful---I'm going to put this on my list of what to discuss with my allergist. I wasn't certain whether I had gotten a definite diagnosis about the wheat allergy---allergist #1 said not to eat wheat after a positive skin test and positive blood test but he didn't actually say "you have a wheat allergy." allergist # 2 was skeptical about my "wheat allergy" in spite of a positive skin test result (I had a lot of positive skin test results some of which he thought were probably false positives) until he realized that I had had a blood test done...his comment (once I got the lab to send him a copy of the test results) was "the test was positive." I got the feeling the case was closed....i.e. he wasn't going to suggest a wheat challenge in his office because it was probable that I am allergic, but I still wasn't sure whether the quotations were entirely removed in his mind....i.e. I'm wondering if I have been diagnosed with a wheat allergy or a "wheat allergy" (if you see the difference :lol: ) I suppose there isn't any difference practically speaking since either way the advice would be not to eat wheat, but it makes a difference to me personally.

Does anyone have any statistics on the RAST test? How probable is it that a positive RAST test + positive skin test = an allergy.

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