Hi, dear I have gone through your question. I can understand your concern. Kell is the antigen present on rbc. Kell is the system of blood grouping antigen just like ABO and Rh system. At time of transfusion it gives reaction with antibodies. So you should match your kell antigen also at time of future blood transfusion. Hope I have answered your question, if you have doubt then you can contact me at bit.ly/Drsanghvihardik. Thanks for using health care magic. Wish you a very good health.