get a blood test ask family member or you family doctor One way is to get copies of your medical records. If your parents are still alive you can also ask them. Ask your doctor. It should be on your notes. I only know because my parents know. I imagine your parents or the caregivers which were responsible for you as a young child (too young for many memories clearly) would know and you could simply ask them. If you can't ask them well .... I guess you won't know unless you catch it. if no one in your family knows your dr or health visitor would probably know or check for little scars Ask the one who lives with you from childhood