Group

While most of us are familiar with the main eight blood types (A+, A-, B+, B-, AB+, AB-, O+, O-), the human blood system is far more complex. The ABO and Rh systems are just two of more than 36 different blood group systems, each with its own set of antigens. Some combinations of these antigens result in incredibly rare blood types. For example, the Bombay blood group (Oh) lacks A, B, and H antigens, making it compatible with only other Bombay blood donors. Another is the Rh-null or "golden blood," so rare that there are fewer than 50 known cases worldwide. People with rare blood types often have difficulty finding compatible donors, which is why organizations maintain rare blood registries, all supported by advanced Blood Group Typing. The existence of these rare types highlights the incredible genetic diversity of the human population and the ongoing challenge of ensuring a sufficient and diverse blood supply for everyone in need.