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Old January 30th 07, 04:45 AM posted to misc.kids.pregnancy
alath
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Posts: 89
Default Biparietal Diameter / 20 week scan


for another scan to keep an eye on the growth.so you're saying the head circumference was normal? but not the diameter?

whilst the head is not a perfect sphere, the two are strongly related and
unless anything else has been said, I rather suspect there has been a
measurement error.


Very unlikely. The first thing anyone does when a measurement seems
out of proportion is to recheck the image, look at the landmarks, and
evaluate whether it was a technically adequate measurement. Often we
will measure the same thing two or three times when a measurement is
odd, just to see if we keep getting the same result. Sometimes the
fetus is in a poor position for a particular measurement, but in this
case, the sonographer/ologist would certainly know this and report
such to the patient.

As I mentioned above, it is possible for the BPD and HC to be
disproportionate, reflecting an unusually round or unusually elongated
head shape. Although, again, this poster's measurements didn't seem
all that extremely unusual when I looked them up on my tables.