Blood types classify blood so healthcare providers can determine whether one person’s blood is compatible with another’s. Blood types include A, B, AB and O.
The ABO blood group - Blood Groups and Red Cell Antigens - NCBI
Universal Blood Type Donors and Recipients
How Your Blood Type Can Determine Your Health Risks
Blood types
Blood types - NHS Blood Donation
What You Need To Know About Blood Type And Your Health
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Blood group antigens are surface markers on the red blood cell
Does my blood type impact my risk of diseases and other conditions?