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Beyond A, B, AB, and O
Most people learn the ABO and Rh labels and reasonably assume that is the whole blood-type story. Transfusion medicine is more complicated: dozens of blood-group systems identify different molecules on the surface of red blood cells. In 2025, the International Society of Blood Transfusion announced the PIGZ system, its 48th recognized human blood-group system at the time.
The extraordinary case of GWADA-negative
The investigation centered on a woman from Guadeloupe whose blood reacted against the tested donors’ red blood cells. Testing began after a 2011 hospital assessment in Paris. Later genetic work identified an exceptionally rare phenotype called GWADA-negative, named for her Caribbean origin.
Why rare blood matters
For a person who needs a transfusion, incompatibility can be medically serious. Discovering a previously unrecognized antigen helps laboratories identify risks and search for compatible blood. This is not a new universal blood type and not evidence that human biology suddenly changed; it is a new scientific classification of a rare phenomenon.
Apep Bar asks
How many other biological exceptions are waiting in laboratory records for the right tools to find them?
References and further reading
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