Meaning of the word "RH factor" in English

What does "RH factor" mean in English? Explore the meaning, pronunciation, and specific usage of this word with Lingoland.

RH factor

US /ˌɑːr eɪtʃ ˈfæk.tər/
UK /ˌɑːr eɪtʃ ˈfæk.tər/
"RH factor" picture

Noun

1.

a group of antigens on the surface of red blood cells, important for blood transfusions and in pregnancy

Example:
Blood type O negative means you have no A, B, or Rh factor antigens.
The doctor checked her Rh factor during her first prenatal visit.
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