Blood Type Compatibility Chart

Interactive tool to check blood type donation and receiving compatibility

Find Your Compatible Types

You Can Donate To

You Can Receive From

Universal Donor O−

O negative blood can be transfused to any patient regardless of their blood type. It's the type used in emergencies when there's no time to test. Only about 7% of the population has O− blood, making it always in high demand.

Universal Recipient AB+

AB positive individuals can receive red blood cells from any blood type. They have both A and B antigens and the Rh factor, so their immune system won't reject any donor type. Only about 3% of the population has AB+ blood.

Donation Compatibility Matrix

Rows = donor type, Columns = recipient type. ✓ = compatible.

Donor ↓ / Recipient → O−O+A−A+B−B+AB−AB+

Receiving Compatibility Matrix

Rows = recipient type, Columns = donor type. ✓ = can receive from.

Recipient ↓ / Donor → O−O+A−A+B−B+AB−AB+

Understanding the Rh Factor

The Rh factor (also called Rhesus factor) is a protein — specifically antigen D — found on the surface of red blood cells. Your blood type is classified as Rh positive (+) if you have this protein, or Rh negative (−) if you don't.

Key rules for Rh compatibility:

  • Rh+ individuals can receive both Rh+ and Rh− blood.
  • Rh− individuals should only receive Rh− blood to avoid an immune reaction.
  • About 85% of the population is Rh positive.
  • Pregnancy concern: If an Rh− mother carries an Rh+ baby, her body may produce antibodies against the baby's blood. This is managed with RhoGAM injections.

Blood Type Distribution by Ethnicity (US)

Blood Type Caucasian African American Hispanic Asian

Frequently Asked Questions

What is the universal blood donor type?▼
O negative (O−) is the universal red blood cell donor type. It can be given to patients of any blood type in emergencies when there's no time to determine the recipient's blood type. This is why O− blood is always in high demand at blood banks.
What is the universal blood recipient type?▼
AB positive (AB+) is the universal recipient. People with AB+ blood can receive red blood cells from any blood type — A, B, AB, or O, whether positive or negative. However, AB+ plasma is not universal; O type plasma is considered the universal plasma donor.
What is the Rh factor and why does it matter?▼
The Rh factor is a protein (antigen D) found on the surface of red blood cells. If you have this protein, you are Rh positive (+); if not, you are Rh negative (−). Receiving Rh-incompatible blood can trigger an immune response. Rh-negative individuals should only receive Rh-negative blood, while Rh-positive individuals can receive both.
What is the rarest blood type?▼
AB negative (AB−) is the rarest blood type, found in less than 1% of the global population. In the US, about 0.6% of people have AB− blood. The most common blood type globally is O+, found in about 37–39% of the population.
Can parents with different blood types have a child with a third type?▼
Yes. Blood type inheritance follows Mendelian genetics. For example, a parent with type A blood and a parent with type B blood can have children with type A, B, AB, or even O blood, depending on whether their A and B alleles are homozygous or heterozygous. The Rh factor is similarly inherited, with Rh positive being dominant.

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