What does the Rh stand for in “Rhfactor”?

RH is short for “rhesus,” in honor of the research monkeys that gave their blood (and sometimes their lives) as Dr. Karl Landsteiner tested out these properties.

About Karen Hill

Karen Hill is a freelance writer, editor, and columnist. Born in New York, her work has appeared in the Examiner, Yahoo News, Buzzfeed, among others.

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