The Normal Fetal Biparietal Diameter Against Week of Gestation in Normal Pregnant Women at Srinagarind Hospital

Abstract

The fetal biparietal diameters (BPD) between 12^th and 40^th weeks were measured by two ultrasonologists, using a Hitachi model 50 A, at Srinagarind Hospital during October 1987-March 1990.  The measurements that were confirmed gestational age by paediatricians after births were 565 occasions in 409 newborns.  The gestational ages were based on the history of the last menstrual period and the correlated fundal height.  No medical, surgical or obstetrical complication was found during these pregnancies.  The mean increase in the BPD between the 12^th and 28^th weeks, the 29^th and 35^th weeks, the 36^th and 39^th weeks were 3.16 ± 0.9, 1.95 ± 1.2 and 0.61 ± 0.6 mm./mk. respectively.  The growth of BPD in this study followd the curves similar to those in Western countries in the third trimester.  The growth of BPD in this study compared with in country study was similar to Chula’s study but it was more than Health Promotion Center 4’s study.