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What is a rare blood type?

Every blood donor is typed for their ABO and Rh type. However, only a small percentage of donors have a rare blood type, identified through additional testing.  In most cases, a rare blood type is shared by just one in every 1,000 to 1,000,000 or more people. Because rare blood types are inherited - just like a person’s ABO and Rh type - people with a common heritage are more likely to share a rare blood type.


Have you already tested me to see if I have a rare blood type?

No, probably not. Because rare blood types are so uncommon, we try to concentrate our testing only on donors that are more likely to be rare types. If our testing indicates that you are a rare type, we will notify you.


You might have a rare blood type that could help special patients in need!

During your health history interview you will be asked to identify your race and/or ethnicity.* While it is completely optional to provide this information, we hope that you will. With your race/ethnicity indicated, we can test your blood to see if it is a match for one of several rare blood types urgently needed by patients with rare blood and platelets needs. By understanding who our donors are, we can best meet the unique needs of our community.

  • This information is strictly confidential and will not be shared with oth


Rare blood types by race/ethnic category

African/African American         U-, Fy(a-b-)

Native American                      RzRz

Asian/Pacific Islander              Jk(a-b-)

Hispanic                                  Di(b-)

Caucasian                               Kp(b-), Vel-


How can you help?

Please indicate your race and/or ethnicity information during your health history interview. You might have a rare blood  type that could help save the life of someone with rare blood needs.


Race/Ethnicity categories:

A:       African

C:       Caucasian

H:       Hispanic

I:        Native American

M:      Mixed

S:       Asian/Pacific Islander

O:      Other