Hello, I have just came out of hospital after getting my tonsils out. There was alot of problems with my operation and I lost alot of blood. They took lots of samples of me incase I needed a blood transfusion. Doctors advised me when my results ame back that there was antigen cw in my blood. I have been issued with a card to acrry with me at all times incase I ever need a blood transfusion. I was told you get this antigen from previous blood tranfusions. However i have never had a blood transfusion and this was actually my first time in hospital ! Can you have this antigen in your blood naturally ? And will it have a big affect on me or my baby if I ever want to start a family ?? Regards Michelle