Blood tests can help you find out if a reaction you’re having is because of an allergy.
They’re often used instead of the more traditional skin test if you have a skin condition or if you're taking medications, like antihistamines, which interfere with those tests.
You may hear it called an IgE (or sIgE) test.
A small amount of your blood is taken and analyzed. A lab checks for proteins called antibodies that your immune system might make in response to something you’re allergic to.
These blood tests may not give you results as specific as those from a skin test. They also tend to be more expensive.
Talk to your doctor to see if they're the right thing for you to get to the bottom of your allergies.