Negative RAST results

Posted on: Tue, 08/28/2007 - 8:39am
jen96ttu's picture
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Joined: 07/11/2005 - 09:00

Just got a call from the allergist that DS's RAST test came back all negative. They did a nut mix and peas. Not sure if I should believe it? At 18 months, his RAST test came back positive for peanut, and at 3 1/2 is when he had his scratch test. peanut was the biggest hive of them all. Now that he is 5 and starting school I fgured we have him RAST tested again to see how it was going. Now they tell me it's negative and I'm not sure if I should believe it. I gues I should make a consult appt with the doc to go over the results to talk to him more about it. I'm just in shock right now.

Posted on: Tue, 08/28/2007 - 9:40am
caryn's picture
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Joined: 11/20/2002 - 09:00

my son had a positive SPT at 2 and a negative RAST at 2 1/2 -- we have retested every year for 4 years and the SPT has always been very positive - huge -- 4+ -- we have not done another RAST -- I am thinking we might this year as I am curious.

Posted on: Tue, 08/28/2007 - 9:57am
saknjmom's picture
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Joined: 04/02/2003 - 09:00

we just got negative rast, but positive skin test for peanut.
I don't exactly know what to think.
Please post what your dr says and if you do skin test.

Posted on: Wed, 08/29/2007 - 4:13am
anonymous's picture
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Joined: 05/28/2009 - 16:42

We just got back my son's RAST results.
His SPT for sesame was 2+ and his RAST was negative. They told me I could do a food challenge for sesame. He has an appt in Nov. I plan to discuss more and then decide.
His RAST for peanut went down, his SPT was the same size and we have discovered he is positive for shrimp now.
His SPT for coconut was negative and so was the RAST, yet I am still nervous about feeding it to him!
Chrissy
DS, AGE 6 - PA, TNA, EA, SESAME, SHRIMP, ENVIRONMENTAL.

Posted on: Wed, 08/29/2007 - 4:53am
SpudBerry's picture
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Joined: 07/23/2002 - 09:00

My son has positive SPT and negative RAST for peanut as well. We know that he reacts to peanuts so we avoid them as strictly as we do for our other son that has RAST > 100 and isn't allowed to have a SPT.
If nothing else - this allergy has made it even more clear to me that even though My children are twins - they are certainly different people.
------------------
Sherlyn
Mom to 7 year old twins Ben & Mike
One PA since 13 months
One PA since 7 years
Stay Informed And Peanut Free!

Posted on: Wed, 08/29/2007 - 5:22am
saknjmom's picture
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Joined: 04/02/2003 - 09:00

Quote:Originally posted by ccm'smom:
[b]We just got back my son's RAST results.
His SPT for sesame was 2+ and his RAST was negative. They told me I could do a food challenge for sesame. He has an appt in Nov. I plan to discuss more and then decide.
[/b]
That is very interesting. Today, I accompanied my SIL to allergist to have her son tested for sesame and peanut. He did spt for peanut (positive btw), but said that sesame needs to be tested with RAST. So, has anyone else had spt for sesame??? Very curious.

Posted on: Wed, 08/29/2007 - 5:31am
chanda4's picture
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Joined: 12/14/2006 - 09:00

Quote:Originally posted by saknjmom:
[b] He did spt for peanut (positive btw), but said that sesame needs to be tested with RAST. So, has anyone else had spt for sesame??? Very curious.[/b]
My son had a scratch test for sesame(58/9) and it was similar to his peanut wheal(30/10)....a couple weeks later we did the rast and it was 51.80(class 5)!!!! His one known reaction to sesame was really bad too(chest pain and neck squeezing)
------------------
Chanda(mother of 4)
Sidney-8 1/2(beef and chocolate, grasses, molds, weeds, guinea pig, hamster & asthma)
Jake-6 1/2(peanut, all tree nuts, all seeds(sesame, sunflower, poppy, pine nut) beef, chicken, eggs, coconut, green beans/all beans, trees, grasses, weeds, molds, cats, dogs, guinea pig & eczema & asthma)
Carson-4 (peanut, tree nuts, milk, soy, egg, beef and pork, cats, dog, guinea pig, hamster, grass, mold, dust mite and EE)
Savannah-1 1/2 (milk, beef and egg, dog(avoiding peanuts, tree nuts, strawberries, seeds, legumes and corn)

Posted on: Wed, 08/29/2007 - 10:30am
anonymous's picture
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Joined: 05/28/2009 - 16:42

Saknjmom,
Did they not do SPT for sesame because maybe they didn't have the vial that contained it to do the SPT? Did the allergist give any reason at all? Just wondering. I am trying to be hopefully that my son's RAST holds more weight than the SPT results in this case!

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