RAST Testing?

Posted on: Sat, 09/30/2006 - 2:56pm
alwaysonmymind's picture
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Joined: 09/14/2006 - 09:00

My son has only had the prick test and that was positive.
Can the RAST test determine how severe his allergy is?
I always his PA was very severe because of his first reaction.
But now i'm thinking a rast test might be interesting to know how high his levels actually are.
is this easy to do?
How is it done?
Do most allergist's do this test?

Anyone who has some answers or is familiar with this kind of testing, please let me know what ya think.'
Natasha

Posted on: Sun, 10/01/2006 - 1:16pm
NicoleinNH's picture
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D
[This message has been edited by NicoleinNH (edited June 09, 2007).]

Posted on: Sun, 10/01/2006 - 3:12pm
alwaysonmymind's picture
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Thankyou
i will make sure he gets a rast test when we see this new allergist.
Logan is 4 and will be 5 in January.
Thanks again for the advice
Natasha

Posted on: Sun, 10/01/2006 - 11:50pm
TRexFamily's picture
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The RAST cannot tell you how severe the allergy is. Higher values mean that the person is more likely to have a rxn.
It is possible for a person who is a RAST category 1 or 2 to have a more severe rxn than someone who is a RAST 5.
It can be useful to track the values over several years to see if they're declining, and see if the person may be outgrowing the allergy.
Anne

Posted on: Mon, 10/02/2006 - 3:31am
amyd's picture
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Joined: 09/12/2006 - 09:00

It's also nice to have a RAST to see what other nuts they might be allergic to... the doctor didn't skin test for all the different nuts, he just ordered RAST for all of them. Since they have to stick the child to draw blood they might as well test for several things at once, I suppose. We're still waiting on our RAST results too.
I was so nervous about how my 15 month old would handle having blood drawn but he didn't even cry! He just stared at the nurses.
Amy

Posted on: Mon, 10/02/2006 - 1:26pm
alwaysonmymind's picture
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HI AGAIN,(CAUTION TURNED OUT TO BE MY LIFES STORY)
I'VE OFTEN WONDERED WHAT IS THE POINT OF THESE RAST TESTS?
IF YOU ARE ALLERGIC, NO MATTER HOW SEVERE YOUR FIRST REACTION WAS, YOU ARE ALLERGIC.
I WROTE A LETTER TO THE PRINCIPAL OF THE ELEMENTRY THAT I HOPE MY SON LOGAN PA 4 WILL BE GOING TO KINDERGARTEN NEXT SEPTEMBER. I AM TRYING TO GET IT NUT FREE. I SOMETIMES THINK THE PRINCIPAL MIGHT ASK HOW BAD THE ALLERGY IS AND FOR RAST NUMBERS ETC. WILL THE PRINCIPAL ONLY LOOK AT NUMBERS? IF THEY ARE LOW WILL HE NOT MAKE IT NUT FREE?
I THINK NO MATTER WHAT THE FIRST REACTION IS, THE NEXT ONE COULD BE DEADLY.
WHY TAKE THE RISK JUST BECAUSE THE NUMBERS ARE LOW.
IF THE PRINCIPAL WONT GO NUT FREE,MY SON DOES HOMESCHOOLING AND AS MUCH OUTDOOR EXPOSURE AND OTHER SOCIAL ACTIVITIES POSSIBLE.
UNTIL I MAKE IT NUT FREE, IF IT TAKES 1 YR 2YR WHATEVER MY SON WILL GO TO SCHOOL.
NOW ALL I KNOW IS HIS FIRST REACTION WAS FULL BLOWN ANAPHALACTIC THE ONLY THING MISSING FROM THE FULL BLOWN IS HE COULD BREATHE. AFTER TAKING HIS FIRST BITE OF A HOMEMADE PB COOKIE. "WHICH I WAS TOLD HE COULD START HAVING BY 3YRS WHICH WAS ONLY A WEEK AWAY,I THOUGHT I'D LET HIM HAVE ONE." HE STARTED CRYING HISTARICALLY IMMEDIATLY AT FIRST, SAYING "PEANUTS IN MY THROAT" I GAVE HIM WATER AND TRIED TO CALM HIM. MEANWHILE WONDERING IS HE HAVING A ALLERGIC REACTION.
THEN HIS LIPS LOOKING PUFFY,LOOKING TIRED,SLEEPING FOR 2 MINUTES , THEN PUUCKING,THEN SLEEPING FOR 5 MINUTES, WAKING UP PUUCKING AGAIN AND THEN THE STOMACH PAINS,THE HIVES WERE UNDER HIS CLOTHING, SO I DIDN'T KNOW HOW FAST THEY APPEARED.
AFTER WAITING AN HOUR FOR MY MOM, TO GET TO MY HOUSE, MY HUSBAND I COULD NOT REACH.
I LIFTED HIS SHIRT BIG BUBBULLY PURPLY HIVES EVERYWEAR ON HIS STOMACH AND LOWER AREA.
BY THE TIME I GOT TO THE CLINIC, I THOUGHT THEY WOULD SEE HIM RIGHT AWAY ."IT'S A EMERGENCY", I TOLD THEM. "HE HAD HIS FIRST BITE OF A PEANUT BUTTER COOKIE AND I THINK HE IS HAVING ALLERGIC REACTION." HE LOOKED SO LIFELESS, I KEPT ASKING HIM IF HE CAN BREATHE, AN HE COULD. THAT WAS THE ONLY THING, HE COULD BREATHE.
THE DOCTOR OF WHICH I ASKED FOR THE EPI , SAID I MIGHT WANT TO SEE MY FAMILY DOCTOR AND GET A EPI-PEN FROM NOW ON.HE PRESCRIBED BENEDRYL, I HAD TO THEN GO TO THE PHARMASIST WITH LOGAN TO GET IT. WORRIED AS EVER I GAVE HIM IT RIGHT IN THE STORE.
THEN IT WAS BED TIME,THE DOCTOR DIDN'T TELL ME TO OBSERVE HIM OR NOTHIN, THE NEXT DAY THE HIVES ARE GONE AND HE SEEMED OK.THANK GOD
THATS IT, FINALLY IT'S TOLD, THE BIGGEST DAY OF MY LIFE.
I WILL NEVER FORGET THAT DAY ITS BEEN JUST OVER A YEAR NOW. I STRIVE TO NEVER LET THAT SECOND ONE HAPPEN. SOMETIMES I FEEL SO HELPLESS, I WANT TO SAVE HIM FROM HIS UNTIMELY DEATH. KEEP HIM AWAY FROM THESE NUTS THAT ARE KILLING OUR CHILDREN ,MAKING THEM FEAR FOR THEIR LIFES.
THEY MAY NOT SAY IT. BUT THEY KNOW THEIR IS SOMETHING BAD OUT THEIR, THAT CAN HURT THEM.
THE NUTS ARE EVERYWHERE JUST WAITING TO STRIKE.
SO SAD.
BUT WHAT CAN WE DO, BUT WAIT AND HOPE FOR THE BEST.
THE THING IS A WEEK BEFORE THIS HAPPENED I WATCHED OPERA AND IT WAS ABOUT DEADLY NUT ALLERGYS.
CHILDREN WERE TELLING HOW MANY TIMES THEY GRASPED FOR LIFE BECAUSE OF THESE NUTS,WHILE DRIVING,WHILE NOT HAVING AN EPI-PEN. THE STORYS BROUGHT ME TO TEARS. I SAID TO MYSELF THAT DAY HOW LUCKY I AM MY CHILDREN DON'T HAVE THAT NUT ALLERGY.
ONE WEEK LATER AND I WASN'T SO LUCKY.
IT WAS LIKE A NIGHTMARE COMING TRUE.
WELL THATS ALL
THANKS SO MUCH FOR LISTENING
SOMETIMES I JUST FEEL SO HELPLESS AND WRITING AND LISTENING TO EVERYONE ELSES POST,REALLY HELPS ME VENT.
THANKS AGAIN
NATASHA

Posted on: Fri, 10/06/2006 - 12:16am
tnmg's picture
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Joined: 10/04/2006 - 09:00

Quote:Originally posted by TRexFamily:
[b]The RAST cannot tell you how severe the allergy is. Higher values mean that the person is more likely to have a rxn.
It is possible for a person who is a RAST category 1 or 2 to have a more severe rxn than someone who is a RAST 5.
It can be useful to track the values over several years to see if they're declining, and see if the person may be outgrowing the allergy.
Anne[/b]
Great post. Our allergist did not perform a RAST when we found out about son's milk and egg allergy. Just a skin prick test. Its been two years and I requested one after his last check to help track his progress. Go ahead and have the RAST done.

Posted on: Fri, 10/06/2006 - 4:16am
smudgesgarden's picture
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Joined: 02/26/2006 - 09:00

i asked our alergist about a rast test and she said she only does one if the person has bad exczma or is one of the kind of people who get hives from just getting a regular scratch. (she used a tec. term for it just cant think of it right now.)
so we never had one.
i just figure alergic is alergic. we avoid peanuts like the plague. we know our limits with dairy...

Posted on: Tue, 10/10/2006 - 2:09pm
alwaysonmymind's picture
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Joined: 09/14/2006 - 09:00

i agree avoidance is the key to keeping my chidren safe also

Posted on: Tue, 10/10/2006 - 11:58pm
Adele's picture
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Joined: 01/31/2005 - 09:00

Quote:Originally posted by TRexFamily:
[b]The RAST cannot tell you how severe the allergy is. Higher values mean that the person is more likely to have a rxn.
IAnne[/b]
I have read, and found this true for myself, that the faster the reaction occurs, the more severe it will be.
It's my understanding that a RAST is not deemed necessary if there is a history of a reaction (s) and if the skin test is positive.

Posted on: Sun, 10/01/2006 - 1:16pm
NicoleinNH's picture
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Joined: 06/21/2003 - 09:00

D
[This message has been edited by NicoleinNH (edited June 09, 2007).]

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