This video covers the entire topic of blood group system. It sums up different scenarios of blood group combination and covers the important topic of erythroblastosis fetalis. Timeline 0:00 Introduction 0:10 Key of blood grouping 0:54 Surface markers of RBCs 2:39 Antibody-antigen 3:18 Determination of blood group 16:16 Erythroblastosis fetalis