Blood Type Compatibility
Find out which blood types you can donate to or receive from — instantly.
About Blood Type Compatibility
What makes O- the universal donor?
O negative blood has no A, B, or Rh antigens on the red blood cells, meaning it won't trigger an immune reaction in any blood type. This makes it safe to give to anyone in an emergency before blood typing can be done.
What makes AB+ the universal recipient?
AB positive individuals have all antigens (A, B, and Rh) on their red blood cells, so their immune system won't react against any donated blood type.
Is this information reliable for medical use?
This tool provides general educational information about blood type compatibility. Always consult medical professionals for any actual transfusion or donation decisions.