Obstetricians specialize in pregnancy and childbirth, not general medicine. When Jane had pregnancy complications, she was referred to an obstetrician.
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Gender Specific
Obstetricians primarily treat women, as their work revolves around pregnancy. After confirming her pregnancy, Lisa needed an obstetrician's care.
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Technical Term
Obstetrician is a technical term best used in medical or formal contexts. The medical seminar included a well-known obstetrician as a speaker.