When my baby is born can they test for a peanut allergy?

I'm already freakin out about my baby possibly being allergic to peanuts... its a terrible allergy and my little sister has it... I remember the first time when she tried peanut butter and started having a reaction she bearly made it, scared my mother to death. Sooo When my baby is born can they test for it or will I just have to wait.?