I need help with RAST scores.

Posted on: Fri, 05/21/2004 - 3:54am
lalow's picture
Joined: 03/24/2004 - 09:00

My son is 16 months. These are his scores. Do they mean anything?
egg white- 1

Posted on: Fri, 05/21/2004 - 4:03am
samirosenjacken's picture
Joined: 09/30/2002 - 09:00

You need to clarify the scores... are these the levels or the class??
A class 1 has a range of .35-.70 and a response % of 71-110
A class 2 has a range of .71-3.50 and a response % of 110-220.
They just go higher from there till you reach a class 6 which has a level >100 and a response >6000.
I think you need to find out if the number you have is the class or the ku/L . It cannot be the % response.
I know someone had posted the actual chart on a link about this subject before but I can't find the thread.
I found the chart:
IgE conc (kU/L)
0.35 - 0.70 Class 0/1 Low Level %71-110
0.71 - 3.5 Class 2 Moderate Level %111-220
3.51 - 17.5 Class 3 High Level %221-600
17.6 - 50 Class 4 Very High Level %601-2000
51-100 Very High level %2001-6000
>100 Class 6 Very High Level >6000
I pulled my son's latest Cap rast just done last week. These were the results from the lab.
My one dd is a class 6 with a ku/l of 92 and a % response over 5800
My other dd is a class 4 with a ku/l of 38 with a % response of 2800.
[This message has been edited by samirosenjacken (edited May 21, 2004).]

Posted on: Fri, 05/21/2004 - 4:06am
robinlp's picture
Joined: 05/14/2002 - 09:00

Here is the chart that came from the lab when we got our last test results:
Levels specific IGE Class
<0.05 0
0.05-0.07 0/I
0.08-0.15 I
0.16-0.50 II
0.51-2.50 III
2.51-12.50 IV
12.51-62.50 V
62.51->100.00 VI

Posted on: Fri, 05/21/2004 - 4:46am
jtolpin's picture
Joined: 05/28/2003 - 09:00

A few things on the results:
Q1) Why did you test these specifically? Have you seen reactions to any/all of these.
I ask, because if you've seen a reaction, the results are irrelevant. Reactions trump scores. If you go into shock from a peanut, yet test 0 to them, you still avoid them, kwim?
There ARE such things, especially under age 3, as false positives and false negatives. You may test positive for something that you do not see a reaction for and have, in fact, outgrown. And likewise, you may test negative, and react to it (see Q #1)
If you want a hard nosed allergists answer it would be something like 'Your child is allergic to all of these and avoid them like the plague' -- Truth be told, he may/may not know what hes talking about...
If you have a dog, and let it lick your child, and theres never been reactions, theres NO reason (right now) to get rid of the dog. Be aware of the test results...
That all being said, what DID the allergist say re: the results? [img]http://uumor.pair.com/nutalle2/peanutallergy/smile.gif[/img]
Quote --
egg white- 1

Posted on: Fri, 05/21/2004 - 5:21am
lalow's picture
Joined: 03/24/2004 - 09:00

I believe they are the class scores because he said there were 6. He said at this age the scores may or may not be accurate. He has had a reaction to our dogs fur, to milk and perhaps to peanut (he found a piece of nutter butter and broke into hives but had also eaten several cheese fish crackers). The other things I have never noticed a reaction to. He eats bananas about 3 times a week and has soy milk fairly often. Eggs I have never noticed either. However, his eczema has not improved since avoiding nuts and milk products. The allergist was talking on the phone. He basically said to keep the epipen jr with me. That low scores did not indicate how severe the reaction might be and that he has a 50% chance of actually having the allergy. He said to avoid all these things for a while and then if I want to I could reintroduce them and see how he reacts. He said to see an allergist in a year or so to reevaluate. I couldnt think of questions but have a list started. I did ask about the dog and cat that we have and he just said he would avoid exposure. I think we have a friend that will take the cat but the dog is another thing. So I dont know what to do.

Posted on: Fri, 05/21/2004 - 7:58am
robinlp's picture
Joined: 05/14/2002 - 09:00

Does anyone know why the charts that we both posted look so different??? Mine came from the lab that the results came from. There seems to be quite a difference.

Posted on: Sat, 05/22/2004 - 2:41am
smack's picture
Joined: 11/14/2001 - 09:00

I could be wrong but I believe samirosenjacken posted the chart for CapRast and robinlp posted the chart for Rast testing.
CapRast is the newest most recent blood test that came out about 4 yrs ago that still a lot of drug plans either don't cover(more expensive) or you don't have a close enough lab that does this test near you.
I live in a fairly big city and almost 3 years ago had the CapRast test done on my son.

Posted on: Sun, 05/23/2004 - 1:34pm
Nicole1401's picture
Joined: 12/27/2002 - 09:00

Does anybody know if Smack is correct that robinlp posted the RAST numbers and samirojackson posted the CAP RAST?
Smack, I don't want to sound like I am questioning you, but your post seemed like you weren't real sure.
And, it is very important to me right now because I am on the verge of switching allergists because my current one has never heard of a CAP RAST test. BUT, my dd's results match the numbers that smack thinks are the CAP RAST. Can a dr order a test he has never heard of? Does the lab automatically perform the CAP RAST?

Posted on: Mon, 05/24/2004 - 1:49am
smack's picture
Joined: 11/14/2001 - 09:00

Hey Nicole 1401,
I bumped up a thread for you which should help with understanding the difference of Cap and Rast tests.
It's called "What does "off the charts" mean?" by laurajean in Main Discussion

Posted on: Mon, 05/24/2004 - 10:45am
Westporter's picture
Joined: 06/25/2003 - 09:00

My DS allergist ordered the RAST test. I asked him for the CAP-RAST and he said he doesn't do CAP-RAST.
Well, once I got a copy of the results, I called the lab directly and was told that only do CAP-RAST since the RAST test is the "old" way. So, I suggest calling the lab directly to ask what type of testing they do. You may be pleasantly surprised!

Posted on: Mon, 05/24/2004 - 11:03am
Polly66's picture
Joined: 02/05/2004 - 09:00

My sons cap rast score for peanuts has gone from 21ku/l to 8.8 since he was diagnosed 5 months ago, does this mean he has a chance of outgrowing his allergy??


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