RAST vs. skin testing

Posted on: Mon, 02/25/2002 - 11:00pm
anonymous's picture
Offline
Joined: 05/28/2009 - 16:42

My 4yr. old son has peanut and egg allergies. We haven't pushed for allergy testing because our ped. doesn't feel it is necessary, and has the "just avoid all nuts and eggs" attitude (we have been VERY happy with him up to this point).

All last week my 2yr. old broke out in hives after eating meals and snacks. We thought we had it nailed down, but now when we anticipate a break out (to confirm our suspicions) - he doesn't.

Needless to say, now we are demanding testing either by him or another dr. on both boys. BUT now -- which do we do?

Supposedly, RAST isn't as accurate. But 4yr. old has eczema (and asthma) and I don't feel comfortable doing a scratch test on him. HELP!! Any suggestions?

THANK YOU!!!!!!!!!

Posted on: Tue, 02/26/2002 - 4:34am
Xena66's picture
Offline
Joined: 08/10/2001 - 09:00

Hi there! My daughter also has eczema and asthma and we had the skin testing done on her at 3 yrs of age. They did it on her back though, which is not usually a problem area for her eczema, and were able to come out with some pretty conclusive results.
Good luck! :-)

Posted on: Tue, 02/26/2002 - 9:39am
jillsmom's picture
Offline
Joined: 02/11/2002 - 09:00

Hi,
My daughter, who also has eczema and asthma, had RAST testing when she was approx.12mos, and prick tests(on her arms) when she was 2&1/2. The results were quite similar, but I like the prick test, because it's done right in front of you and the results so concrete, because you see the affected area as it changes.
jillsmom

Posted on: Tue, 02/26/2002 - 10:00am
Melrose Mum's picture
Offline
Joined: 01/23/2002 - 09:00

I would get the CAP RAST for Peanut, it is a special type of RAST test, it will tell you the likelyhood of a reaction after an exposure. eg. a score of 15 means there is a 95% chance of a reaction to an exposure -- (I think!, I don't remember, sorry, my daughter is 'off the chart' somewhere over 100 so I really don't remember how the lower scores break down.) The reason I suggest the CAP RAST for peanut (not sure if they have it for egg, it only exists for 4 allergens) is because it is QUITE accurate, unlike the regular RAST test. AND it is better than a skin tset in that you are not having to deal with and 'exposure' to the allergen.
good luck!
Diane
BTW IF the CAP RAST comes back with a REALLY low score, so low that you think that there might not even BE an allergy, you can always 'do' a skin test. hope this helps.

Posted on: Tue, 02/26/2002 - 1:39pm
anonymous's picture
Offline
Joined: 05/28/2009 - 16:42

Thanks for all the encouraging info.
Those of you who have been through the skin testing -- was it pretty uncomfortable for your child?
I was also concerned about Drew being exposed to the peanut allergen during the skin test. Did that bring about a nasty reaction on your child?
He has only been exposed one time for maybe one second (or less) on his tongue, he spit it out, began screaming, breaking out in hives and his eyes started swelling.
I'm REALLY nervous about all this, but it helps getting info. from people who know. THANKS!!!

Posted on: Tue, 02/26/2002 - 2:08pm
skanb's picture
Offline
Joined: 05/24/2001 - 09:00

Both of my ds's have had skin tests on their backs. They both have eczema, and my older has asthma. Both of them did fine with the skin tests. Each time, they tested about 32 sites on their backs, and each son started twitching while they had about 8 to go. We were able to talk them through to the end. Recently my older was just scratch tested to 18 more sites on his back, and 8 injections under the skin on his arm. He said the under the skin injections were the worst, but it may just have been that he could see the needle. I can't say for sure. We got pretty conclusive evidence for each boy's testing. Good luck! Kristi

Posted on: Tue, 02/26/2002 - 9:08pm
Jandy's picture
Offline
Joined: 05/21/2001 - 09:00

Hi,
We've done both ways, skin was at age 3-1/2 and 6. Since then we've done the CAP RAST each year. However, this year we will have RAST testing done- which used to be done incorredtly but know is done correctly and is just about the same as CAP RAST testing.We won't do skin testing re huge welts(I guess these were large hives) that appeared at age 6 at peanut site and other places on his body. Plus it is a exposure to the allergen- several others on this site had PA have life-threatening reaction to the skin prick.
Yes, they can test egg by RAST. My son has 7 things tested but had more when he had more allergies. Results were consistant between the two types of testing. Another reason I like the RAST testing is that learn which allergen are likely to be outgrown and at what levels food challenges can be done.
Once child gets over the fear of needle having blood drawn is quick and less uncomfortable than skin testing- even at 3 he was very itchy at the possitive sites and didn't feel well. I got him a game to play with each time and had reward of toy after blood work. Even now at 11 he expects 3 dollars to buy something as reward.
Take Care,
Jandy

Posted on: Wed, 02/27/2002 - 3:30am
Anonymous's picture
Anonymous (not verified)

Jacob has been skin tested twice. The first time his reaction was only at the test site on his back. He is allergic to peanuts and tree nuts and his welts were as about the size of an orange. His second skin test had the same results but he also experienced a literal allergic reaction to it. He started complaining of his throat itching, sneezing, coughing (also has asthma), and then diarrhea. They watched him closely and gave him Benadryl. I will NEVER allow him to be skin tested again.

Posted on: Wed, 02/27/2002 - 2:31pm
rebekahc's picture
Offline
Joined: 12/02/1999 - 09:00

CAP RAST testing is avaiable for a wide variety of foods. Logan has so many allergies we do both the skin and CAP RAST tests. We first do the skin to narrow down our list and then do the CAP RAST to confirm the skin results. Most recently Logan was tested for 70 different foods. Of those, we CAP RAST tested him for the 32 that he had the largest reactions to to see if we indeed need to avoid those foods. Where the CAP RAST and the skin test are both positive we avoid.
Logan's allergist will NOT skin test him for peanuts because it is too dangerous.
Rebekah
P.S. Logan has asthma and eczema.

Posted on: Thu, 02/28/2002 - 8:07pm
Jodi's picture
Offline
Joined: 10/28/2000 - 09:00

My son was skin tested at 18 months for peanuts, dust mites, eggs and soy. We didn't have any problems. His peanut reaction was about the size of a nickle. I thought that was really bad at the time, but from what I heard from other people, his reaction was pretty mild. We didn't have any after effects either. The welt went down by the end of the day on its own and that was it. No other reactions. Maybe this means he is only mildly reactive to peanuts and not severe? I'm not sure. He has not been RAST tested which I am planning to ask about having done when we go to our appointment next week. He is now 4 and had eczema as an infant/toddler but seems to have outgrown it in the last year or two. No asthma (as of yet anyway).

Posted on: Thu, 02/28/2002 - 11:07pm
smack's picture
Offline
Joined: 11/14/2001 - 09:00

Jodi,
I just read your post and I am thinking the same about perhaps my Austin since his welt wasn't that big 6mm diameter on the wheal.
He had infancy eczema and grew out of it around 2? His skin is beautiful. I just am waiting for the Cap Rast results from his allergist. He had that done 4 weeks ago. The Secretary would only tell me that the results were positive but I'm hoping for a lower score since he never reacted with the size of a orange ever on the scratch tests.
I'll let you know.
[This message has been edited by smack (edited March 01, 2002).]

Pages

Peanut Free and Nut Free Community

Click on one of the categories below to see all topics and discussions.

Latest Discussions

Latest Post by lexy Tue, 01/28/2020 - 12:21am
Comments: 6
Latest Post by JRM20 Sun, 01/26/2020 - 11:15am
Comments: 6
Latest Post by JRM20 Sun, 01/26/2020 - 11:11am
Comments: 5
Latest Post by Italia38 Wed, 01/15/2020 - 11:03am
Comments: 10
Latest Post by Italia38 Wed, 01/15/2020 - 10:52am
Comments: 2
Latest Post by penelope Tue, 01/14/2020 - 1:03pm
Comments: 1

Peanut Free Store

More Articles

Which candy bars are safe for those with peanut allergies? Those without allergies are accustomed to...

Are you looking for peanut-free candies as a special treat for a child with...

For those who have wondered whether airport x-ray machines negatively affect epinephrine auto-injectors, the folks at Food Allergy Research &...

Molecular allergy component testing identifies the specific food or environmental proteins triggering a person’s allergic reactions. Component...

An epinephrine auto-injector provides an emergency dose of epinephrine (adrenaline) to treat life-threatening allergic reactions. Those who have...

Misunderstanding the significance of food allergy test results can lead to unnecessary anxiety and dietary changes. The three tests used most...

It can be easy to overlook the presence of nut allergens in non-food items because the allergens are often listed by their Latin or scientific...

Tree nuts and peanuts are distinctly different. An allergy to one does not guarantee an allergy to the other. Peanuts are considered legumes and...

Welcome to the complex world of being a Peanut Allergy Parent. Get ready to proofread food labels, get creative with meals, and constantly hold an...

Take control of your food allergies! Get results in ten days and change your life forever! If you are tempted to use a home testing kit...

What can you eat if you can't eat peanut butter? Fortunately for people with a peanut allergy, there...

According to the Asthma and Allergy Foundation of America, one out of five people in the U.S. has an allergy. Because there is a...

Eliminating peanut butter is the best way to handle a rash caused by this food

If your baby or toddler develops a rash caused by peanut...

Nearly all infants are fussy at times. But how do you know when your baby's crying means something wrong? Some babies are excessively fussy...

For those who don't have experience with peanut allergies, going 'peanut-free' often seems as easy as avoiding peanut butter sandwiches and bags...

A new study shows that there may be a link to peanut ingestion in pregnant mothers and peanut allergy in their children.

Dr. Scott Sicherer...

When people think of nut allergies, they tend to think of peanuts. In fact, a sizable number of people are allergic not to peanuts (which are...

Cakes are a central part of many celebrations, from kids' birthdays to weddings. For those with severe ...

Are you looking for a high-protein snack that you can take with you? If you are allergic to peanuts, this is harder than you might think. Peanuts...

If you or a family member are allergic to peanuts, eating dinner out can pose a significant risk. Even if the menu item does not contain...