Blood grouping is based on the presence of specific antigens on red blood cells. The ABO system categorizes blood into four groups: A, B, AB, and O, each with corresponding antibodies in the plasma. Blood type compatibility is crucial for safe blood transfusions, with type O being the universal donor and type AB the universal acceptor. Understanding blood grouping prevents adverse reactions during transfusions and is essential for safe medical practices. Learn about blood groups, universal donors, and universal recipients. O negative (O-) is the universal donor, and AB positive (AB+) is the universal recipient. Find out the prevalence, compatibility, and importance of blood types in India. To determine which blood groups are universal donors and universal acceptors, we need to understand the characteristics of different blood groups and their compatibility. Learn what it means to be a universal blood donor or recipient, and how blood typing works. Find out the difference between acute and delayed reactions, and how blood types affect organ donation.