forms of testing?

Posted on: Tue, 10/09/2001 - 1:12pm
Mommy's picture
Joined: 06/20/2000 - 09:00

My daughter tested negative with the prick test and positive with peanuts being put on her arm with a with a piece of skin pricked in it. What does this mean?

Posted on: Tue, 10/09/2001 - 10:53pm
BENSMOM's picture
Joined: 05/20/2000 - 09:00

I've never really heard of the second method, but it sounds pretty much the same as a skin prick test. I've been told that a negative skin prick test is pretty accurate--not a high rate of false negatives. I would follow up with a CAP RAST which is a blood test.

Posted on: Tue, 10/09/2001 - 11:39pm
California Mom's picture
Joined: 07/14/2000 - 09:00

How old is your child? The second method of skin testing sounds riskier to me. While it may be basically the same thing as "traditional" skin testing, it sounds like it leaves room for more of an exposure, which you really want to avoid if your daughter is allergic - because avoiding all exposure increases the chance that your daughter could outgrow the allergy.
Has your child ever reacted to eating peanuts? What made you decide to get her tested? I agree with Bensmom that the next step should be a CAP RAST test.
Also, we had previously had a concern that our daughter might be allergic to sesame seeds. Our allergist said that there was no reliable serum to do a skin test for sesame seeds. Someone at the Food Allergy Network suggested that the doctor could crush up sesame seeds and essentially do a skin test the way your doctor did the second time. Our allergist told me she did not feel comfortable with this method. She felt that there was a much greater chance of a false positive result, due to impurities in the actual food, (or something like that) rather than using serum created in a sterile laboratory environment. She opted to go for a RAST test, instead.
If there is one thing I've learned from this site (and I've actually learned many!) it is that each allergist seems to have his or her own beliefs and ways of doing things. I have been quite surprised to see the lack of a "standard" way of diagnosing food allergies.
Good luck! Miriam
[This message has been edited by California Mom (edited October 10, 2001).]

Posted on: Wed, 10/10/2001 - 12:27am
margaret's picture
Joined: 11/01/2000 - 09:00

Just a reminder, Never Do A Food Challenge at Home, only in the controlled environment of a Doctor's office with resucitation supplies available.

Posted on: Thu, 10/11/2001 - 1:37pm
Chicago's picture
Joined: 04/21/2001 - 09:00

I agree with Margaret's comment above. While we are a great community for advice and support (excellent stuff!!) we still don't have the knowledge and the details to reccomend specifics for your child - or understand their test results.
Don't be afraid to call your doctor with questions. If they are too busy, or rude or such, get another doctor. Many of us (me too) have been conditioned to think of doctors as busy gods that should not really be bothered, but they are really service providers and you are the customer!

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