Skin testing


Hi all,

Wondering what your experiences have been re: skin testing. My latest RAST was 0, and the next step is skin testing. I am, of course, terrified. My skin has gotten itchy on contact with pb before, and I am just scared of what could happen in a skin test. Did anyone have a horrible reaction, or did your children? If I pass the skin test the next step is obviously oral challenge which I can't even think about.

My history is adult onset PA during pregnancy with ds. I got an itchy throat while eating pb sandwich. Later, I got itchy hands while making a sandwich for hubby. All Of my Rasts have been zero, however, and my allergist wants me to do further testing due to the anxiety I have about exposure to peanuts.

What do you all think?

On Sep 25, 2008


On Sep 25, 2008

For my child who has anaphylaxis to contact, I would not do skin testing. I have read too many stories where someone has needed Epipen after skin testing.

You have to do what you feel is right for you. If your rasts have always been zero, then why the reactions? What I mean is maybe the rast is a false negative. Go with your gut on how you feel, don't be forced into something you are not comfortable doing. Best of luck with your decision.

On Sep 25, 2008

I have heard of false positives with RAST, but not false negatives.

The reason I am even considering the skin test is the anxiety I feel all the time regarding accidental exposure. I know this is something all pa p-eople and parents have to deal with, but if I am doing it for no reason, it would be good to know. If my rast and skin test are both negative, he says I have a 99% chance of no allergy. It would be good to know if it is, in fact, gone since I only had issues while pregnant/breastfeeding that child.

On Sep 25, 2008

With my youngest child, the Rast has been negative to all things and then skin test is done and we get some positives. My second child has allergies, not to the extent of my first, however, Rast is negative to things and then we get positives with the Skin Testing. I know there are allergies because of the symptoms. I always figured that the Rast can have false negatives.

I understand what you are saying though that you want to know. At least you know that you are in the right place should you have a reaction with skin testing.

Best of luck. Let us know how it goes.

On Sep 25, 2008

I had my DS SPT when he was 4 months old then again at 16 months. He didn't have a RAST done at 4 months so I can't compare the numbers to his RAST at 16 months. At 16 months his RAST is barely over the positive mark at .40. His SPT results though are much higher.

At 4 months his SPT wheal for pn was 9mm and at 16 months it was 10.5mm. Personally he never had any issue with either SPT. He was of course a little itchy but after being cleaned up and I gave him some benedryl (also since he was off his Zyrtec and benedryl for a few days leading up to the SPT) he was fine. I won't be doing anymore SPT though unless he falls below the negative level and I certainly will NOT do a food challenge unless he were to have a negative SPT.

You have to do what you are comfortable doing and certainly don't let anyone pressure you into anything. If your RAST came back negative I would certainly say the SPT would be the next step. If feel comfortable from that you can then decide to do the food challenge. Take it in baby steps and do what you feel comfortable with. Keep us posted on what you decide and how it goes! :-)

On Sep 25, 2008

Thank you both so much for the info. I am just really scared and don't know if I will even do it. With my RAST showing nothing, I feel a bit more confident, but still, I have no known exposures since the PB sandwich for my hubby and that was 2 years ago.

What prompted my thinking of going is two incidents recently where I could have been exposed and they scred the heck out of me. One was at the store and the other was at a doctor's (Doctor's!) office where the receptionist was eating peanuts and handing stuff to me. I was scared to death to touch that stuff.

So, I figured rather than dwelling on all of this for the rest of my life, I should go and confirm. Allergy or none. And move on with my life.

On Sep 25, 2008

I would do the skin test if I were you. If your rast was negative, a negative spt might put you at ease. The only thing is that the only way to prove that you are not allergic is to do a food challenge (in the proper setting of course with dr. approval). My ds had a borderline + SPT for shrimp at 3 years old and then at his 4 year old visit the SPT was negative. My allergist still considers him as allergic until we do a food challenge. Good Luck and try not to stress to much. I know that is easier said than done :-)

On Sep 25, 2008

I think if I do the skin test and it's negative, I might stop there. He told me that even with a negative rast not to worry to much but the spt would put me at ease a little more.