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 Post subject: Skin Prick Testing
PostPosted: Mon Sep 29, 2008 10:01 pm 
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Joined: Sat Sep 27, 2008 10:30 pm
Posts: 1
Location: Toronto
Do you need to eat an allergen first, in order to receive a positive skin test result? i.e. could you be allergic to walnuts, but receive a negative skin test prick because you haven't ingested them yet?
Thanks!


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 Post subject:
PostPosted: Tue Sep 30, 2008 6:51 am 
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Joined: Tue Mar 22, 2005 11:17 pm
Posts: 6456
Location: Ottawa
You can be come allergic to a food that you don't believe you have come in contact with because of trace ammounts on foods which you have eaten in the past.

The first time you ingest a food to which you develop an allergy, your body creates antibodies to fight the percieved threat. The next time you eat a food, the anti-bodies go to work creating a chain of events which result in an allergic reaction.

False positives have happened and false negatives can happen if the serum is old. Some people find that with certain fish serums they do better to bring fresh samples of the allergen.

An experienced Allergist should be aware of the chance of false test results in relation to your description of the symptoms.

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Daughter: asthma, allergies to egg, milk, peanuts, tree nuts, most legumes (not soy) & penicillin. Developing hayfever type allergies.
Husband: no allergies
Me: allergies to some tree that flowers in May
Cat: allergic to beef, pork and lamb


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