Best Free Blood Type Compatibility Checker Online — Donors, Recipients, and Pregnancy
What the Tool Shows
Blood Type Compatibility shows: all compatible donor types for your blood type, all recipient types your blood can be given to, Rh factor compatibility, and pregnancy Rh considerations if applicable. Select any of the 8 blood types (A+, A−, B+, B−, AB+, AB−, O+, O−) to see the complete compatibility chart.
Red Cells vs. Plasma Compatibility
Important: the compatibility rules for red cell transfusions are different from plasma transfusions. For red cells: ABO and Rh must be compatible. For plasma: ABO compatibility is reversed — AB plasma is the universal donor for plasma (contains neither anti-A nor anti-B); O plasma can only go to O recipients. The tool shows red cell compatibility (most common use case).
Practical Use Cases
Know your type for emergency situations (medical ID bracelet). Plan blood donation (understand who benefits most from your specific type). Understand pregnancy compatibility if you’re Rh negative. Educational reference for medical students and curious individuals.
Frequently Asked Questions
Check compatibility now
Open Blood Type Compatibility tool — enter your blood type to see who you can donate to and receive from.
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