The reason they ask you what your allergic to is the same reason they ask you to verify your date of birth and name to make sure there has not been a mistake recorded the secretary is an idiot who just has to write something down she has no idea what you're allergic to or how that may interact with what you're getting the nurse or medical assistant needs to make sure that it is correct and the person administering the shot needs to make sure that is correct as well because the nurse may not understand the interactions it's basically a cover-your-ass technique so unless you're wearing a medical bracelet stating your information it's going to be confirmed each time