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The BPD and OFD are measured on a transverse axial section of the fetal head which includes the falx cerebri anteriorly and posteriorly, the cavum septum pellucidum anteriorly in the midline and the thalami.

The BPD is measured from the outer edge of the nearer parietal bone to the inner edge of the more distant parietal bone. The long bones are measured with the bone across the beam axis.

Doing an ultrasound to estimate fetal weight near term is a very common practice, one still employed by many OBs, especially with large mothers.

However, research clearly shows that this is a very questionable practice.

The abdominal circumference is measured at the level of the liver and stomach, including the left portal vein at the umbilical region.

A number of studies have questioned the use of ultrasound for estimated fetal birth weight.These measurements are more appropriately used in the assessment of fetal growth, particularly in the second half of the pregnancy, than in the assessment of gestational age.It is, however, an appropriate measurement in the second trimester to demonstrate normal fetal proportions.Although many embryonic and fetal structures can be measured, only a few measurements are easy and repeatable enough for widespread use.Gestational Sac: The first element to be measurable is the gestation sac of the early pregnancy.Percentile Example: Out of 100 babies, a reading of forty percent (this is the percentile value) indicates that the baby is smaller than sixty other babies and larger than forty other babies. A value that reads below 50% indicates that the measurement is lower than the average.