How Accurate are Blood and Skin Allergy Tests?

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Well, I’ve officially started allergy shots. Not long ago they conducted a skin allergy test on me to see if that might be contributing to my chronic ear/sinus/respiratory infections. They had already once run an allergy blood test on me (which showed I was only allergic to dogs), but they said the skin allergy test was more accurate and wanted to see what it read. So, I took a week off from all allergy medicines (which was awful in itself in many ways…and who knew that going off Zyrtec could cause withdrawal symptoms???), and then went for the allergy test.

They ended up poking me almost 100 times, checking various strengths of 27 different common allergens. By the time the lady had gotten to the third round of testing (around the 60th shot), I was really struggling to make it through. Fibromyalgia makes your pain response to anything worse anyhow, and getting stuck that many times can begin to feel like some kind of medieval torture device. By the end, my arms looked like cheese graters, with rows of holes all over them.

I waited a few minutes for the nurse to tally the results and found out I was allergic to 22 of the 27 things they tested for, which means 3 vials worth of shots that I’ll have to take for the next 3-5 years. While the ENT doctor does not think this alone is at the root of my chronic infections, she definitely thinks it could help.

The thing that frustrates me greatly is that I was tested for all this stuff by blood test a few years ago and it only showed ONE allergy! How in the world could the blood test be that inaccurate that it didn’t show one other allergen, when I am allergic to at least 21 other common allergens to the point that I need long-term treatment? I know for a fact many of the things I tested greatly allergic to in the skin test WERE also things they tested for in the blood test. In fact, for the skin test, I tested LESS allergic to dogs than many of the other allergens that didn’t show up at all in the blood test! How could the first test have been so inaccurate, and do physicians know exactly how inaccurate the test can be? If so, it sure would have been nice if someone would have told me back then. Maybe it could have helped prevent a few years’ worth of pain and suffering!

I’m curious, has anyone else had both tests and had such widely varying results? If so, did anyone ever explain to you why? I would sure like to know for myself.

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2 thoughts on “How Accurate are Blood and Skin Allergy Tests?

  1. Ouch! I’m glad you wrote about this as someone I know just had the allergy blood test, which revealed nothing. I might look into the skin test. It’s hard to find good information on allergy testing.

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    • Yeah, I would definitely tell the person you know that if they think they DO have allergies and the test might have been wrong, to follow up with the skin test. It was not a fun experience, but if the allergy shots help at all I hope it will be worth it in the end. My main worry now is that the allergy shots themselves may cause problems with my asthma since I have had a couple asthma attacks out of nowhere since getting the shot this week. Hoping it is something else, like just a bug or something.

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