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Do blood group and blood type refer to different classifications of blood (A, B, AB, O vs. something else), or are they used in different contexts to refer to the same thing?

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Never heard of blood group. Blood type is A, B, AB, O, and a few crazy cases at least in American English. –  virmaior Jan 21 at 5:38
    
@virmaior Some have never heard of blood type, they always knew it as blood group! –  Kris Jan 21 at 6:47
    
thefreedictionary.com/blood+group blood group n 1. (Medicine) any one of the various groups into which human blood is classified on the basis of its agglutinogens. Also called: blood type –  Kris Jan 21 at 6:50
    
@kris. Point noted ... and this would be British English? or ... –  virmaior Jan 21 at 6:52
    
@virmaior Currently, the terms are synonyms and completely interchangeable in both AmE & BrE. However, blood type appears about four times more frequently on COCA (AmE), than blood group. –  Kris Jan 21 at 7:07
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Blood group and blood type are largely synonymous, but are often not used synonymously.

this article discusses blood groups, and introduces the act of blood typing as well.

Blood group tends to be used when discussing the A, B, AB, O, and Rh blood cell surface antigens.

The discovery of the ABO blood group, over 100 years ago, caused great excitement.

Blood type tends to be used when discussing individual members of a blood group, e.g.

8-yr-old Thalassaemia patient with rare blood type looking for donors

In addition to the ABO and Rh types are many more types which aren't contained in groups, such as H (or Bobmay antigen) and Le -/+ (Lewis) types. In the article about the child with a rare blood type, his type is found in only 14 people in Pakistan.

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They mean the exact same thing. I would guess that they are used in different contexts but could be used in the same context.

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