Blood types
Learn how the ABO and Rh systems work and who can donate to whom.
Compatibility chart
| Type | Can donate to | Can receive from | Frequency |
|---|---|---|---|
| O- | A+, A-, B+, B-, AB+, AB-, O+, O- | O- | 7% |
| O+ | A+, B+, AB+, O+ | O+, O- | 37% |
| A+ | A+, AB+ | A+, A-, O+, O- | 36% |
| A- | A+, A-, AB+, AB- | A-, O- | 6% |
| B+ | B+, AB+ | B+, B-, O+, O- | 8% |
| B- | B+, B-, AB+, AB- | B-, O- | 2% |
| AB+ | AB+ | A+, A-, B+, B-, AB+, AB-, O+, O- | 3% |
| AB- | AB+, AB- | A-, B-, AB-, O- | 1% |
- O Negative (O-)
- O Positive (O+)
- A Positive (A+)
- A Negative (A-)
- B Positive (B+)
- B Negative (B-)
- AB Positive (AB+)
- AB Negative (AB-)
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This information is general and does not replace advice from a health professional. Your eligibility is always decided at the donor screening on the day of donation. Rules change, so confirm with the American Red Cross or the blood center where you plan to donate.