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In general, the rarest blood form is AB an unfavorable and the most common is O positive. Here"s a break down of the most rare and common blood types by ethnicity, follow to the American Red Cross.

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O positive:

African-American: 47%Asian: 39%Caucasian: 37%Latino-American: 53%

O negative:

African-American: 4%Asian: 1%Caucasian: 8%Latino-American: 4%

A positive:

African-American: 24%Asian: 27%Caucasian: 33%Latino-American: 29%

A negative:


African-American: 2%Asian: 0.5%Caucasian: 7%Latino-American: 2%

B positive:

African-American: 18%Asian: 25%Caucasian: 9%Latino-American: 9%

B negative:

African-American: 1%Asian: 0.4%Caucasian: 2%Latino-American: 1%

AB positive:


African-American: 4%Asian: 7%Caucasian: 3%Latino-American: 2%

AB negative:

African-American: 0.3%Asian: 0.1%Caucasian: 1%Latino-American: 0.2%

How is blood kind determined?

A person"s blood form is based on whether or no they have certain molecules or protein — called antigens — on the surface of your red blood cells, follow to the nationwide Institutes that Health. Two of the main antigens offered for blood typing are known as "A antigen" and "B antigen." world with kind A blood only have A antigens on your red blood cells and those with kind B blood have actually only B antigens. People with form AB blood have both; people with type O blood have neither.

Another protein, the "Rh factor" — additionally known together the "Rhesus" mechanism — is additionally present or lacking on red blood cells. A person"s blood type is designated as "positive" if they have the Rh protein on their red blood cells, and "negative" if they don"t have actually this protein.


Is blood kind genetic?

Yes, a person"s blood type is genetic, inherited indigenous his or she parents, follow to the Red Cross.

Blood form and transfusions

Blood inputting is an especially important because that blood transfusions, because certain antigens top top blood cells can trigger a person"s immune system to attack the donated blood.

People who are Rh-negative can only receive Rh-negative blood, but people who space Rh- positive have the right to receive one of two people Rh-positive or Rh-negative blood, the Red overcome says.

What"s more, form A blood can be provided for transfusions for patients with form A or type AB blood; kind B blood deserve to be used for patients with form B or kind AB blood; and form AB blood have the right to be provided for patients with kind AB blood. Form O blood have the right to be offered for patient with type A, kind B, kind AB and type O blood.

What blood form is the "universal donor"?

People with type O blood are referred to as "universal donors" since this kind can be used for patients with any blood type.

Type O blood is often in brief supply in hospitals, due to demand for this universal donor type, according to the Red Cross. In particular, type O-negative blood is in high demand due to the fact that it"s the one most regularly used for emergencies, when there may not be time to identify a patient"s blood type.

What space "rare" blood types?

Although ABO and also Rh teams are the most vital blood groups for transfusions, there are numerous other antigens that have actually been discovered on the surface of people"s red blood cells. A person"s blood kind is rare if their blood go not have actually an antigen that most human being have, or if your blood does have an antigen that most people lack, follow to the Cleveland Clinic. Specifically, rare blood varieties are those that are found in 1 in 1,000 civilization or fewer.

One of the rarest blood varieties in the civilization is known as "Rh-null;" fewer 보다 50 human being in the civilization have been found to have this blood type, earning the the name "golden blood," the Cleveland Clinic says.

Can blood varieties change?

A person"s blood type does not normally change, definition it remains the very same throughout life. Yet in some rare cases, blood type has been recognized to change, consisting of in situations of bone marrow transplants and in people who occurred certain varieties of cancers or infections, according to the Cleveland Clinic.

Blood type and pregnancy

Blood type can be an problem in pregnant if the mom is Rh an adverse and the fetus is Rh positive. (The fetus deserve to inherit the Rh factor from either the mommy or the father.) That"s because, in this situation, the mother"s immune system have the right to react come the fetus" "positive" blood. For this reason, pregnant women have their blood tested to determine blood type. Those with Rh-negative blood deserve to be treated through a drug called Rh immunoglobulin to stop a damaging immune reaction if their fetus has a confident blood type, according to the Cleveland Clinic.

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How to uncover out your blood type

If friend don"t recognize your blood form you can ask her health care provider if they have actually a record of it. If they don"t, you may have the ability to request blood keying the following time you get your blood drawn, according to CNN. Girlfriend can additionally find out your blood kind if you donate blood, follow to the Cleveland Clinic. There are likewise at-home blood test that have the right to tell you your blood type.

Additional resources

This post is for informational functions only, and is not intended to offer medical advice. This post was to update on Sept. 10, 2021 by Rachael Rettner.