Pulsed Doppler on a vaginal probe.
Kiserud
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D004622:Embryo, Mammalian / Q000000981:diagnostic imaging*; D005260:Female; D006801:Humans; D011247:Pregnancy; D011261:Pregnancy Trimester, First; D011296:Prenatal Diagnosis / Q000379:methods*; D014463:Ultrasonography; D014621:Vagina