Biparietal Diameter Bpd Ultrasound Normal Range

Royston and wrighti4 and altman15 have.

Biparietal diameter bpd ultrasound normal range. Measurements of biparietal diameter bpd occipito frontal diameter ofd anterior and posterior. The use of the biparietal diameter bpd. Your doctor is looking for the bpd measurement as well as the other measurements to be within what is considered normal range. Measurements within the normal range can also be assessed.

Normal deviations are shown in brackets in the chart below. Since all of these measurements are strongly related to gestational age it is not usually important how they are combined. It increases from about 2 4 cm at 13 weeks to about 9 5 cm at term. Ultrasound obstet gynecol 1994 4 34 48 the patients fulfilled the following.

Biparietal diameter bpd in 27 fetuses with open spina bifida measured at 11 13 week scan and in the same fetuses between 16 and 24 weeks when spina bifida was detected plotted on the modified bpd reference range of kurmanavicius et al. Bpd together with head circumference hc abdominal circumference ac and femur length fl are computed to produce an estimate of fetal weight. Biparietal diameter bpd this is the diameter between the two sides of the head and is measured after 13 weeks. 18 limited to the 12 25 week interval.

The fetal biparietal diameter bpd was measured by ultrasound during normal pregnancy in 558 nigerian women. In the second trimester this may be extrapolated to an estimate of gestational age and an estimated due date edd. Reference ranges for fetal head ultrasound biometry have been reported by a number of investi gator. In most cases bpd biparietal diameter hc head circumference ac abdominal circumference and fl femur length are used.

The normal ranges for fetal biometry presented in this section were established from cross sectional data on 1040 singleton pregnancies at 14 40 weeks of. The range of bpd values for each week of pregnancy from 12 weeks until term 713 measurements was computed from cross sectional data. Measurements of the fetal biparietal diameter bpd and head circumference hc have become established methods of assessing fetal size1 and determining gesta tional age4 5. Gestational age was calculated from the first day of the last menstrual period lmp and confirmed either by an ultrasound crown rump length measurement during the first trimester or by an estimate based on multiple ultrasound parameters biparietal diameter bpd head circumference hc abdominal circumference ac and femur length fl of.

Itisrecommendedthatdepartments whichadoptthecharts tables in this document check that any data programmed into their ultrasound and computerised patient management sys tems use the ga and size equations given here.