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How Does Allergy Blood Testing Work?

After an outdoor walk, do you find yourself with watery eyes and sniffles? When you wake up in the morning, is your nose stuffed up? Does a fun evening at your sister’s house playing with her dog turn you into a sneezy, itchy mess? Are you repeatedly breaking out in hives after eating a certain food? 

All of these scenarios can be the result of allergies making you miserable. If you don’t know exactly what you are allergic to, it’s time to do allergy blood testing to figure out what is triggering your sneezing, watery eyes, hives, and other symptoms. Unfortunately, an allergic reaction can even trigger an asthmatic episode as well. 

IgE Levels

So, what is allergy blood testing? This type of blood test measures the amount of immunoglobulin E (IgE)—an antibody your body makes—in your blood. If you have allergies, your IgE levels will be much higher than the standard IgE range. This is a result of your body viewing typically harmless substances as threats, so your body makes IgE antibodies to fight them off. And this then results in your body experiencing all the annoying symptoms of an allergic reaction. 

Test Preparation

You do not need to do anything to prepare for allergy blood testing. This is different than if you get skin testing done at an allergist’s office. Skin testing often requires you to avoid taking antihistamines and other certain medications for a set amount of time. However, a blood test does not require this and can be done without any prior preparation. 

Allergy Blood Testing Results

Once you receive the results of the allergy blood tests, you should consult an allergist to have your results interpreted and formulate a plan to help you deal with your allergies. In addition, a blood test cannot determine the severity of an allergy. Only an allergist can determine this for you. 

It is important to note that reading the results of the blood tests is not as simple as reading the results of a pregnancy test. While a negative result usually means that you are not allergic to that specific substance, a positive result is not quite as conclusive. In fact, these tests can have 50 to 60% false-positive results. This can be result of many things, including your body simply reacting to foods you’ve eaten recently or your body reacting to a similar food that you are actually allergic to from that same family. For example, if you are allergic to peanuts, the test might show you are allergic to green beans or other legumes when you are actually not. This is why it is so important to have an allergist interpret and advise on the test results. 

Fast Results

All Labs Today wants to help you discover what is causing your sniffles, hives, itchy eyes, and other frustrating symptoms. From allergy test panels to individual allergen tests, we have the testing needed to help you get results! No appointment is necessary! And you won’t even have to wait weeks for results—we pride ourselves on our fast results, often even available on the same day!