Tested Test

What allergies can be tested for with a blood test?
I have allergy symptoms, but i’m not sure what i’m allergic to. I’m having a blood test soon, and was wondering if a blood test can be used to diagnose any allergy, or only allergies to certain things? and if so, which possible allergens can be tested for? Thanks so much
All allergies can be tested for using a blood test. The blood test will show if you have IgE (the part of the immune system that causes allergies) to a certain substance.food/thing/ whatever. The trouble is you have to be very specific about the allergen. For instance, there are at least 3 different allergens in milk, which one do you want to be tested against? Casein is the most common milk allergen, but it doesn’t mean that you are necessarily allergic to casein if you’re allergic to milk.
A single blood test cannot show you all of your allergies. I suggest going to an allergist and getting a skin prick test.
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