H-deficient is a very rare blood type, only one in a million  has it, mainly because the blood is exceptionally prized with vampires.

Humans with this type of blood are described by vampires as smelling "very good" and/or 'delicious' ," suggesting it also tastes better than normal or other types of blood. It is so valuable to vampires, that one pint is described as being worth more than a whole truck with the other blood types.

In Blood Drive Ethan's blood type is revealed to be H-deficient blood, in a deal for his friends he gives his blood to the nurses.

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