篠塚 憲男, 升田 春夫, 香川 秀之, 武谷 雄二

Norio SHINOZUKA, Haruo MASUDA, Hideyuki KAGAWA, Yuji TAKETANI

東京大学産科婦人科学教室

Department of Obstetrics and Gynecology University of Tokyo Faculty of Medicine

キーワード : Estimated fetal weight, Fetal growth, Growth curve, Ultrasound measurement

The standard growth curves for assessment of fetal growth by ultrasound measurement were established based on the analysis of a large number of cases. Fetal weight (EFW) was estimated by applying these ultrasound measurement parameters: biparietal diameter (BPD), femur length (FL), product of anteroposterior trunk diameter and transverse trunk diameter(APTD×TTD), and abdominal circumference (AC). Each parameter that confirmed gestational age during early pregnancy and delivery at full term on an appropriate date was used. A total of 14159 measurements were taken from 3762 cases. Outlier data were excluded by probability analysis, and nominal distribution of the data at each gestational week was confirmed. To make clinical application of the growth standard easier, we calculated regression formulas that estimate mean value±SD of each measurement as a function of gestational age, and gestational age as a function of measurement value. Our mathematical growth curve made it possible to assess growth simply from the deviation of the measurement value from the mean. Use of the trendgram deviation value of each measurement should make the fetal growth pattern easier to use in clinical assessment, especially in cases of IUGR.