Does anyone have info on this??

Posted on: Wed, 07/09/2003 - 12:22am
samirosenjacken's picture
Joined: 09/30/2002 - 09:00

I think I found it here but now I can't remember. I want to find an article that says you really can't tell by the "class" on a cap rast if someone will have an anaphylactic reaction. I read an article that said there's no way to predict how someone will react just b/c of their levels being too high or too low.

I have a neighbor who just had a child diagnosed with a score of 10 on the rast. I believe that put him in a class 3. The docs are saying it's pretty low and no big deal. Living with this, I feel differently and would like to show her some evidence that she should still be concerned about it.

Posted on: Wed, 07/09/2003 - 3:27am
river's picture
Joined: 07/15/1999 - 09:00

Found this at the American Academy of Allergy, Asthma and Immunology:
"Recently, a new method of RAST testing known as the CAP-RAST FEIA test has been reported as being useful in determining reactivity to certain foods. The result is reported in units called KUA/L. For example: an IgE antibody level of over 6 KUA/L to egg, over 32 to milk, over 15 to peanut and over 20 to fish were highly predictive (greater than 95% chance) of having some type of allergic reaction among highly allergic children. However, lower values still may indicate a potential for having an allergic reaction. This CAP-RAST test may be useful in following levels of particular IgE antibodies over time to see if the patient is outgrowing the allergy."
It does mention that lower levels can still mean an allergic reaction, and the part about testing to measure whether the allergy is being outgrown should be taken with a grain of salt---especially after reading nikky's post.
Also if levels go up and down according to exposure and other factors---do these numbers mean anything or is it only a matter of being either positive or negative?

Posted on: Wed, 07/09/2003 - 4:05am
maggie0303's picture
Joined: 04/14/2003 - 09:00

My DD is a class 3 and her reactions include tightening of her chest and swelling throat and tongue. This has been from small amounts only.

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