Blood type math

Who can give blood to whom, how common each type is, and which donations are most needed.

Component

  • Compatible
  • Not compatible
  • ABDAntigen present
  • ABAntibody in donor plasma
  • Population share

Tap your blood type in the grid. Tap again to clear.

Which donations are most needed?

Donation rate needed

How often each type’s donors would need to give to meet demand, against the average donor. Tap a type to highlight it.

Average donor

Where the score comes from

Patients ÷ people who can donate to them, per group.

CountedCan’t receive

The charts assume hospitals give of patients their own type and use of O− units in emergencies. These are the best estimates.