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An ultrasound scan with volume reconstruction and study of chorion blood flow in pregnant women with a luteal insufficiency was carried out. The volume of chorion and the parameters of volume flow rate, the vascularization index and the blood flow index were determined. It was established that in women with luteal phase insufficiency, a slowdown in the development of a chorion tree from the early stages of pregnancy is observed. At weeks 5-8 a significant decrease of the vascularization index to 7.81±1.03 was observed. At weeks 12-13, more significant changes of this indicator were detected (9.55±0.88), pointing for a risk factor in the development of primary placental dysfunction. [ABSTRACT FROM AUTHOR]