When/how/where to test younger sibling for PA/TNA?

Posted on: Thu, 08/23/2007 - 6:43am
carpediem's picture
Joined: 01/08/2007 - 09:00

My younger son is almost 3. Of course, we have avoided/delayed all major allergens and some other common ones as well, (including during nursing) since he is high-risk, due to his brother's PN/TNA.

He has never had peanuts or tree nuts, of course, so would it show up on a blood test if he is allergic if he's never been exposed to it?

Since we don't bring it into the house, do they do this in clinic?

What age? Is it 3 or is it 4? Thanks! Hoping for the best!

Posted on: Thu, 08/23/2007 - 9:18am
seanmn's picture
Joined: 10/01/2003 - 09:00

My 5 year old ds was just tested for peanuts today. His 7 year old brother has a peanut allergy.
He ate peanutbutter M&M's in the allergists office. She put them into different piles and he had to eat a pile every half hour or something like that. My DH took him, so I am not positive on the time. With every pile the number of M&M's increased. He did not have any kind of reaction. They were there for 3 hours.
It is such a relief!!! I realize he could still develop some kind of allergy in the future, but for now I can be thankful.

Posted on: Thu, 08/23/2007 - 10:29am
Jen224's picture
Joined: 05/22/2006 - 09:00

Just curious--can't they do a RAST or a SPT first? I think I'd be scared to give straight up peanuts in an allergist's office without knowing the first two tests were negative.
Glad the test went well for you!
DS#1--3 years old: allergic to peanuts & fish
DS#2--5 months old: NKA

Posted on: Thu, 08/23/2007 - 2:02pm
gw_mom3's picture
Joined: 02/14/2000 - 09:00

My younger two have not been exposed as far as we know. We've avoided for all kids and they don't go to public school, so they haven't had any opportunity to have anything with nuts. We recently had them skin tested and they were negative for everything (they did the full panel). They are 8 and 10. We had always said we should get it done but kept putting it off. Our insurance was changing so it was our last chance to get them tested with full coverage. The allergist is confident that they aren't allergic. He said false positives are more common than false negatives with skin testing.
eta: they have both recently eaten orowheat buns (may contain traces of tree nuts) with no problems. I would be really nervous to let them eat something with actual nuts in the ingredients since they do all 3 tend to drink from the same water bottle, use the same cup for teeth brushing, etc. And their toothbrushes are all in the same compartment in the bathroom drawer.
[This message has been edited by gw_mom3 (edited August 24, 2007).]

Posted on: Thu, 08/23/2007 - 2:08pm
solarflare's picture
Joined: 02/07/2002 - 09:00

Joey was never tested. Allison was only tested because we were trying to figure out which foods were triggering her eczema. Ryan will probably not be tested either... he just won't get them until he turns 5.
Cheryl, mom to Jason (9 MFA including peanuts, tree nuts, shellfish, coconut, sesame, squid)
Joey (8 NKA)
Allison (4 milk allergic, suspect shellfish, avoiding PN/TN for now)
Ryan (1) nka *knock on wood*

Posted on: Thu, 08/23/2007 - 10:19pm
NCMom's picture
Joined: 04/30/2003 - 09:00

We tested our youngest son when he was 3 1/2. I wanted to do RAST but we did skin testing because the allergist said it would be immediate and accurate. He was negative to peanut, almond and all the other allergens they used. We were thrilled. It wasn't until I gave him a few pistachios when he was closer to 4 that he had a major reaction. I was shocked. We took care of the reaction and drew blood the next week fo RAST. Turns out he's highly allergic to pistachios and cashews (still negative to peanut and almond) - they didn't test for all tree nuts, only a few. The ones he wasn't allergic to! In hindsight, I wish we had just done the RAST and included all tree nuts with the peanuts. At least we found out before we started preschool and I'm glad his reaction happened at home instead of school. Good luck.

Posted on: Thu, 08/23/2007 - 10:25pm
seanmn's picture
Joined: 10/01/2003 - 09:00

Quote:Originally posted by Jen224:
[b]Just curious--can't they do a RAST or a SPT first? I think I'd be scared to give straight up peanuts in an allergist's office without knowing the first two tests were negative.
Glad the test went well for you!
Oh, yes. He was tested for everything a few months ago and everything came back negative. I just wanted to expose him to peanuts to make sure he could be around them and to make sure he was really NOT allergic.

Posted on: Fri, 08/24/2007 - 12:16am
jami's picture
Joined: 09/02/2004 - 09:00

For my younger DS we waited until 3 to expose him to any nuts. We wanted to send him to preschool soon--so we felt we needed to know if he was allergic.
The older son's allergist wouldn't run a rast until he had been exposed to each nut/peanut 2 seperate times--he felt it would be a waste of a test to run it with out prior exposure.
I sent older son to his aunts house and did not tell him what we were doing. I did do it in my home--with benedryl,one of the older sons epi-jr, and a prescription filled for predinisone--and the hosptial is down the street. I bought a small can of mixed nuts--so yeah they would all be contaminated--but I didn't want to buy more than we would ever need.
First taste of almond--he says I don't like it-I moved the phone closer to me--I encouraged him to eat the whole almond. After which he threw up, I gave benedryl and called the Dr. and told him I was not continuing. He of course said that was fine--watch him closely--and wait another year on the nuts, and maybe he just threw up because my son was reading my stress. (Ok--I sorta buy that--it was stressful--and we had always told him nuts were a no-no they could hurt your brother)
4 hours later we were in the emergancy room with hives, swollen mouth area, and retractive, shallow, pinched sounding breathing.
** my family doctor was previously willing to prescribe an epi-pen jr. for younger ds, to send to school until he was older and he wanted to try nuts. I wanted real answers--I almost wish I had gone with the family Dr. The almond trial started a downhill spiral of allergy problems. That of course could have happened anyways--it was a time bomb just waiting.
Michelle mom to:
DS #1- 7 - peanut, tree nut, asthma,environmental allergies
DS-#2- 4- Milk, Peas, Peanuts, Tree nuts, Asthma, environmental allergies

Posted on: Fri, 08/24/2007 - 1:49am
SydNoahsmom's picture
Joined: 03/01/2007 - 09:00

My son was skin tested at 2 1/2 and was negative. He had never had or been exposed to peanuts or nuts of any kind prior to this. Because the SPT was his "1st" exposure we did a repeat SPT 4 months later which was also negative. Just before he turned 3 we did a taste challenge in the office. He had some Reeses peanut butter cups in increasing amounts every 15 minutes. Then he went on to the peanut M&M's. He passed with flying colors and thought it was Christmas getting to eat all that candy.
The reason we had him tested so early is because he was to start preschool this fall and I needed to know if he was allergic or not before school started. Thankfully he is not allergic.
Good luck!
Mom to:
Sydney 4 1/2 Allergic to: Egg, Peanut, Tree Nuts, environmental/seasonal and asthma
Noah 3 allergic to Penicillin

Posted on: Fri, 08/24/2007 - 3:25am
kandomom's picture
Joined: 01/12/2006 - 09:00

Older DD is PA. Younger DD was treated as allergic from birth until 5 1/2yrs old.
Wanted her tested before kindergarten (treated as allergic during 2yrs of preschool- no epi prescription though).
SPT was negative. 2wks later challenge in allergist's office. PB on lip 1st. 30min nothing. Progressed to eating 1/4 pb cup. Wait 30min. Eat 1/4 pb cup. Wait 15min then eat the rest. Wait 30min.
We brought a game, books and chatted.
All total it took about 3hr office time.
She is not allergic and has pb on occasion. It is nice not having to worry about her at school/parties etc.

Posted on: Sun, 08/26/2007 - 3:36pm
carpediem's picture
Joined: 01/08/2007 - 09:00

Thank you. I was wondering if they need to be exposed to it first for it to show up on a blood test.



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