 [ Symptoms ] how do you learn your blood type  even though i have had my blood drawn quite a few times i do not know how you can learn what type you have my dad says i needed blood transpered from my grandpa on his side when i was born and he is ab+ so does that make me that type or something else [ Disease ] you would need to be blood typed by a laboratory test you can not rely on genetics when it comes to blood type i do not know your age but if you are old enough to donate blood you will find out your blood type for free