AB- Blood Type
AB- can donate to 2 blood types and receive from 4 blood types.
How common is AB-?
AB- is typically the rarest ABO/Rh combination in populations studied, combining the least common ABO group with Rh-negative status.
Can I donate if I'm AB-?
Eligibility to donate blood doesn't depend on your ABO or Rh group — the same general rules apply to every blood type: donors are typically 17–65 years old, weigh at least 50 kg, are in good general health, and wait at least 8 weeks (56 days) between whole-blood donations. What does depend on your type is how much your donation is needed: your AB- blood can go to 2 of the 8 blood types, and is always in demand from patients who share your type.
AB- and pregnancy
If you are Rh-negative (like AB-) and pregnant with an Rh-positive baby, your body can develop antibodies against the baby’s blood type. This is routinely screened for at the first antenatal visit and managed with an Rh immunoglobulin (RhoGAM) injection — it is not a reason to avoid pregnancy, just a reason to get tested early.
Compatibility shown here is for red blood cell donation, the most common type of blood donation. Always confirm eligibility with clinical staff at the donation site. Read the full blood donation guide for eligibility and donation intervals.