how do i know if i'm allergic to peanut butter?
user
You don't.  An allergic reaction to peanuts can include hives, breathing difficulties, anaphylactic shock, and death.  It's much better to avoid exposure to peanuts, than to get a test that is likely to come back negative.
assistant
Okay, so I can get a test for it?
user
A test isn't really needed.  People usually have no way of knowing beforehand if they'll have an allergic reaction, and the test may only show positive results for a percentage of those who have a genuine allergic reaction.  Most doctors will advise against taking the test.
assistant
how do i know if i'm allergic to peanut butter?
user
You don't.  An allergic reaction to peanuts can include hives, breathing difficulties, anaphylactic shock, and death.  It's much better to avoid exposure to peanuts, than to get a test that is likely to come back negative.
assistant
Okay, so I can get a test for it?
user
A specific test is not necessary.  This is because many people have a slight immune response to peanuts, but no symptoms.  The symptoms of a true allergic reaction can be quite severe.  It's also possible to have a food allergy and have no symptoms when eating the food.
assistant
how do i know if i'm allergic to peanut butter?