佐藤 章¹, 劉 雪美¹, 山辺 紘猷¹, 経塚 光夫¹, 井戸川 敏彦¹, 遠藤 力¹, 山口 祐¹, 康 春華²

Akira SATO¹, Yukimi LIOU¹, Hironori YAMANOBE¹, Mitsuo KYOZUKA¹, Toshihiko IDOGAWA¹, Chikara ENDO¹, Yu YAMAGUCHI¹, Shunka KOH²

¹東北大学医学部産科学婦人科学教室, ²仙台社会保険病院産婦人科

¹Department of Obstetrics and Gynecology, Tohoku University School of Medicine, ²Department of Obstetrics and Gynecology, Sendai Insurance Hospital

キーワード : ultrasonic scanning, fetus size, crown-rump length, bipanetal diameter, sex differences

In order to know the difference between male and female fetus size during pregnancy, a series of normal pregnancies were studied by ultrasonic scanning. We measured the parameters of gastational sac and crown-rump length in first trimester. Also we measured the parameters of biparietal diameter, head circumference, chest circumference, abdominal circumference from 20 to 42 weeks of gestation. According to our results, male fetuses were already larger than female ones in first trimester.