O- blood type
O-negative is the universal red cell donor: it can be given to anyone, so hospitals reach for it in emergencies before a patient's type is known. It's also one of the types most often in short supply.
Select your blood type:
Type O-
~6% of the U.S. populationO-negative is the universal red cell donor: it can be given to anyone, so hospitals reach for it in emergencies before a patient's type is known. It's also one of the types most often in short supply.
You can give red cells to
You can receive red cells from
Your plasma can help
Plasma compatibility is the reverse of red cells (and Rh doesn't matter). Your plasma can go to people with type O.
Whole blood or Power Red
The best way to donate if you're O-
The most valuable donation for O- donors is whole blood or power red. Learn more about the different ways to donate, then find a center near you.
Sources & method
The donation guidance on this page reflects published criteria from these organizations. Eligibility and procedures vary by center and country, so confirm specifics with your donation center.
- American Red Cross
- AABB (Association for the Advancement of Blood & Biotherapies)
- U.S. Food & Drug Administration — Blood Donation
- Canadian Blood Services
Last reviewed: