There are four major blood groups ( A , B , AB , and O ), which were discovered by Austrian scientist Karl Landsteiner in 1901. From those groups, the eight most common blood types are derived (A+/A-/B+/B-/AB+/AB-/O+/O-). Although there are rare exceptions to these categories that affect certain individuals with blood disorders, the vast majority of people fall into one of these eight types. The blood type that a person has is inherited from his/her parents, and a person who is in need of a blood transfusion must be given blood from someone with a compatible blood type. How Is Blood Type Determined? Determining one’s blood type can be done with a simple blood test in the doctor’s office. The physician would then inform the patient of his/her blood type once the results are received. Should an Individual Be Responsible for Knowing His/Her Blood Type? While there is no law or regulation that requires each person to know his/her blood type (as this would be ridiculously imp...
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