Test Results - Does this mean anything?

Posted on: Fri, 09/07/2007 - 4:26am
CanadaPA's picture
Joined: 01/14/2005 - 09:00

My son did his 4th prickskin test yesterday. In the past, he reacted as soon as the prick went in his arm very quickly it went large. This time however, it took about 3-4 minutes before he reacted. Should I be optimistic? Could this mean something? Obviously, I'm not changing a thing we do. He is still just as allergic as before. Has anyone else had a similar expericence? Or do I just read too much into little things?


Posted on: Fri, 09/07/2007 - 10:43am
Gilli011's picture
Joined: 12/05/2004 - 09:00

Our dd's had their allergy re-test this summer and both my dh and I noticed that it took a few minutes for the reaction to occur instead of the almost immediate reaction during their first spt (2.5 yrs ago). That being said our allergist told us that there was no change in their pa...one is 2+, and one is 3+, no better, but no worse. I still can't help but hope that the longer time before reaction might be a good sign. No real answer for your question...
Cheers, Gilli

Posted on: Fri, 09/07/2007 - 11:28am
Daisy's picture
Joined: 01/16/2006 - 09:00

Did the histamine prick also react slowly? Was it larger than the negative prick? You have to compare all results to the positive & negative controls.
One time, after my old Allergist retired, I sought out another Allergist after a wasp sting reaction. Since it had been 10 years since I was SPT'd, she retested me with the general panels for my food/environmental allergies. I didn't react to shellfish on the SPT, but I'm very positive w/ documented reactions. I also didn't react to much else, and my histamine control was very weak. This was very significant to me, but she didn't really believe I was as allergic as my old Allergist had declared, even after she saw my previous results I had brought in. [i]I also questioned the nurse's ability as she was very talkative/distracted and said "oops" a couple of times. I think some of the spots she hit with the wrong solution. Especially after I showed up a 2+ for banana??[/i]
At this point, I didn't know what to think. My RAST tests were also very non-reactive. And the SPT/RAST testing for wasp, bee, yellow jacket, hornet etc...was pretty negative. [i]My neighbor and I both saw a wasp...looked like a red wasp. I was stung multiple times as a small child, so this was not unexpected.[/i]
She did very wisely prescribe Epi's, since I did react shocky enough to the sting to have to go to the ER for treatment (Epi, steroids & Benadryl).
Sometimes, a welt on the negative control or multiple welts on many allergens is indicative of dermatographism, or reactive skin.
And the absence of a welt on the positive control is indicative that something else is wrong, or that the patient has taken antihistamines recently.
Would your Doc be open to ordering a RAST? I know in Canada the RAST is not used as extensively as it is in the US, and is costly...but it can give you a better idea of a weakening allergy. It's a good idea to keep a copy at home so you can track the results over time.
Good luck,

Posted on: Fri, 09/07/2007 - 10:43pm
lakeswimr's picture
Joined: 02/01/2007 - 09:00

Yes, it *could* mean something but I wouldn't take it to mean anything if the final result was positive. Positive is positive = be very, very careful! My son seemed to have a smaller test result to dairy and egg a year and a half ago. The allergist actually said if my son were older he would food challenge both based on the skin test but since he was so young and probably would not be able to communictate clearly if he was having throat swelling or feeling ill he would not do a food challenge in his office and "if you really want I will send you to Children's and they will do it there." Well, no, we wanted to wait to do a challenge until *he* felt it was a good idea and that DS would probably pass. He felt that DS *might* pass both. That whole next year I felt we were kind of participating in a farce that DS was still allergic to dairy and eggs (although I was sure of the peanut and sesame). I felt funny taking precautions in situations that there nut, peanut and sesame-free but had dairy and eggs. I kind of let my guard down a bit. Well, last December DS had full on ana to a very small amount of egg. He ate a tiny brownie (and I mean tiny) and the very last of many ingredient was egg (my terrible mistake from rushing). Anyway, that showed me. I should treat all his allergies equally seriously. If the test is still positive I will be vigilant (sp?) as ever, no matter if it *seemed* lower. I will hope the change in result indicates that DS will eventually outgrow the allergy but for now he is still allergic.
I'm sorry. I do hope and think it is possible this change indicates your child might outgrow the allergy or that future reactions could be less severe. But if the result was positive I would just continue to strictly avoid and take all the usual precautions.
Best wishes!


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