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August 16, 1919, Vol 73, No. 7 >
ARTICLE | August 16, 1919

ANOTHER DIAGRAM FOR BLOOD GROUPING

M. W. Lyon, M.D.
JAMA. 1919;73(7):498. doi:10.1001/jama.1919.26120330002010c.
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Several diagrams have been published1 showing the interrelations of the human isohemagglutination groups, and the manner of determining the group to which any person belongs by the use of serum obtained from persons of Groups II and III. By using both cells and serum of a person of Group II (or III) and those of an unknown person it is nearly as easy to determine the group to which the unknown person belongs as it is with serum of known II and III groups. While this fact has been long appreciated, so far as I am aware it has never been expressed diagrammatically. The diagram herewith is an attempt to do so.

In case the determination is to be made with a known III person, III should be substituted for II in the diagram, and II for III.

As about half of all persons fall into either Group II

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