Growth of the Fetal Biparietal Diameter During Normal Pregnancy

Abstract

Summary The fetal biparietal diameter was measured by ultrasound during normal pregnancy. The range of biparietal diameter values for each week of pregnancy from 13 weeks until term (1029 measurements) was determined and longitudinal data (646 measurements) were used to illustrate the variation in growth rate according to fetal maturity, head size and weight.

Accuracy of an average ultrasonic laboratory in measurements of fetal biparietal diameter, head circumference and abdominal circumference

“…curacy as that reported by CAMPBELL and NEWand R.T. (figure 2). These results are in agree-MAN who have estimated gestational age within ment, at least as regards BPD, with other pub-plus or minus 7 days by a single determination lished papers [12,14] and suggest that differen-of BPD before 24 weeks [5]. This relatively low ces in confidence limits of standard growth degree of precision is by far better than that curves at different gestational ages mainly re-provided by certain dates, which has been reflect biological variability rather than the ported to vary between plus or minus 29 days degree of accuracy.…”

“…as A gD for BpD of Q 9? ^ ^ & d of i between measurements obtained from line and acc which can be estimated by the fbllowfrom retained photographs, significant differen-m example: a BPD of 50.2 mm, which when ces occurred among operators using R.T. (HC: referred to CAMPBELI/S growth curve [5] ) ™ th 95% of confidence limits. The higher value may actually fit with When one deals with data obtained in an ultra-the 5th centile for the 21.4 weeks while the sound laboratory where different people are lower one may fit with the 95th centile for the using different machines, it should be known 18.3 weeks.…”

Analysis of fetal growth restriction in pregnancy in subjects attending in an obstetric clinic of a tertiary care teaching hospital

“…The present study corroborates with the findings of Campbell. 35 Significant decrease in abdominal circumference was observed in the present study in the IUGR group it was 26.4 cms at 36 weeks when compared to control group of normal pregnancies (32.5 cms); whereas earliest difference was observed at 28 weeks, it became significant at 32 weeks. This observation correlates well with the findings of Chitty LS et al, who could diagnose 87% of IUGR at 32 weeks by USG abdominal circumference alone.…”

Pregnancy-specific β1-glycoprotein (SP1) in serum from women with pregnancies complicated by intrauterine growth retardation

“…Reliable diagnosis of this condition and/or monitoring of already diagnosed IUGR must depend upon a combination of clinical and laboratory approaches [9] as well as on an accurate estimation of gestational age. If there is any doubt about the length of a pregnancy* an early ultrasound examination will give correct dating [3]. With reliable dating, the simple "gravidogram" can be used as a routine examination and 75% of infants of low birth weight for their gestational age can be detected [29].…”