Blood Type Compatibility Calculator
Check Blood Type Compatibility
Find donation and receiving compatibility for your blood type
Donor-Recipient Match
Check if a specific donor and recipient are compatible
Formula
Blood type compatibility is determined by the presence or absence of A, B, and Rh(D) antigens on red blood cells. Recipients must not receive antigens they lack.
Frequently Asked Questions
What is the universal donor blood type?
O-negative (O-) is the universal red blood cell donor type. O- red blood cells can be given to anyone regardless of blood type, making it critical for emergency transfusions.
What is the universal recipient blood type?
AB+ is the universal recipient. People with AB+ blood can receive red blood cells from any blood type.
What is the rarest blood type?
AB-negative is the rarest blood type, found in less than 1% of the population. O+ is the most common, found in about 37% of people.
Why does blood type compatibility matter?
Receiving incompatible blood can cause a hemolytic transfusion reaction, where your immune system attacks the donated red blood cells. This can be life-threatening.
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