Ultrasound Scanner

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Ultrasound Scanner

ultrasound measurement.?

So anyone understand this ultrasound measurement thing.
Sorry I don't have a scanner so I couldn't upload the picture.

Here is what it said. This is the measure of my baby head.

BPD=7.39cm
GA=29w5d 23.4%

OFD (HC)=9.93cm
HC=28.02cm
GA: 30w5d 29.2%

Thanks for all the answer.
This ultrasound were done when I'm 30 weeks and 2 days.

BPD = Bi-parietal diameter. This is the distance between the two parietal bones in your baby's skull. (The parietal bones make up each side of the skull). So it's essentially the measurement of your baby's head from ear to ear.

GA = Gestational age (length of pregnancy). They have calculated this from the BPD (skull measurement), as in the average gestational age of a baby with a 7.39 cm is 29 weeks and 5 days.

I'm pretty sure that the 23.4% is the percentile your child falls into right now. I assume you are actually farther along than 30 weeks? So that would mean you're baby's BPD is in the 23.4 percentile: 76.6% of babies who are at the same point in your pregnancy have a bigger head. But this is just a guess - I might have a better answer if you could tell us exactly how many weeks and days you were when this ultrasound was done.

OFD = Occipitofrontal Diameter. This is a measure of your baby's head from back to front; from the
occipital bone (the very back part of the skull) to the frontal bone (forehead).

HC = Head Circumference. Your babies head is 28.02 cm around. It looks like they calculated the gestational age again based on your babies HC (refer back to the detail about GA and percentiles).

I'm not sure why HC is in parentheses after OFD. My best guess is that they used the OFD measurement to calculate the HC, since they can only measure straight lines on a sonogram.

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