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PostPosted: Sat May 26, 2007 9:31 am 
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Joined: Wed May 16, 2007 10:41 am
Posts: 54
Location: Virginia, USA
I had both tests done and results are different for the 2 tests. I have several positives on the Specific IgG test and everything was negative on the RAST test. I have gone ahead and went through a food elimination/challenge test and most of the Specific IgG test results seem to be accurate.

Why is one test coming up with positives and the other are all negative? I don't get it. :shock:

Oh, also I had the skin prick tests done and no foods came up positive but shellfish but they blew it off, why?


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PostPosted: Sat May 26, 2007 4:21 pm 
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Joined: Thu Sep 22, 2005 11:39 pm
Posts: 1141
Location: saskatchewan, canada
I think the RAST and skin tests measure IgE not IgG.

_________________
DD age 9 1/2 -peanuts, nuts,
DD age 7 1/2 - milk, eggs, chicken, peanuts, treenuts, cats, dogs,
DS age 2 1/2
Husband- asthma, eggs, treenuts, fish, shellfish environmental
Self - penicillan, eurithromiacin, mild laytex allergy.


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PostPosted: Mon May 28, 2007 8:20 am 
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Joined: Wed May 16, 2007 10:41 am
Posts: 54
Location: Virginia, USA
saskmommyof2 wrote:
I think the RAST and skin tests measure IgE not IgG.


I still don't know the difference though and after the food elimination, the IgG testing is correct, so far. I'm having reactions to the foods I have challenged.


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PostPosted: Mon May 28, 2007 11:06 pm 
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Joined: Tue Mar 22, 2005 6:53 pm
Posts: 1454
Location: Canada
I've never heard of specific IgG testing . . . is this through an allergist or someone who practices complimentary alternative medicine? While an "allergy" involves IgE, other parts of the immune system (i.e. IgG) can be involved in some adverse food reactions. I didn't know that they could test for anything either than IgE. But I'm not sure if technically an IgG mediated reaction is considered an "allergy." i.e. if you have an IgG mediated reaction, I don't think that you will have anaphylaxis (but I'm not certain about this . .. )


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PostPosted: Mon May 28, 2007 11:24 pm 
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Joined: Thu Sep 22, 2005 11:39 pm
Posts: 1141
Location: saskatchewan, canada
ELISA/ACT can detect IgG (though I'm not sure exactly what elisa/act actually is :oops: ), and IgG can be involved in delayed reactions.

_________________
DD age 9 1/2 -peanuts, nuts,
DD age 7 1/2 - milk, eggs, chicken, peanuts, treenuts, cats, dogs,
DS age 2 1/2
Husband- asthma, eggs, treenuts, fish, shellfish environmental
Self - penicillan, eurithromiacin, mild laytex allergy.


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PostPosted: Tue May 29, 2007 10:06 am 
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Joined: Wed May 16, 2007 10:41 am
Posts: 54
Location: Virginia, USA
saskmommyof2 wrote:
ELISA/ACT can detect IgG (though I'm not sure exactly what elisa/act actually is :oops: ), and IgG can be involved in delayed reactions.


I think this is what it's all about; delayed reactions like migraines and depression. But I am finding that I am having immediate reactions now that I have eliminated and challenged these foods. Weird!


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