title: Doppler ultrasound method for detecting human fetal breathing in utero.
abstract: An audible Doppler ultrasound method for detecting human fetal breathing movements in utero has been developed. The frequencies synchronous with fetal breathing movements probably originate from the lung rather than the chest wall. This method is much cheaper and simpler than the ultrasound A-scan method and is suitable for screening large numbers of people.
mesh_terms: D003365:Costs and Cost Analysis; D004301:Doppler Effect; D005260:Female; D005333:Fetus / Q000502:physiology*; D005865:Gestational Age; D006801:Humans; D011247:Pregnancy; D012119:Respiration; D013997:Time Factors; D014463:Ultrasonography