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Dr. Andrew Rynne
MD
Dr. Andrew Rynne

Family Physician

Exp 50 years

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What Does -1.8SD Mean?

Hello. I am on my 35 weeks and 3 days. My ultrasound reads;
BPD is 81.9 mm and GA = 31 weeks 6 days with and SD -1.8.
FL = 68.4 mm, GA = 38w0d (1.4SD),
FTA = 74. 21 cm^2, GA = 36 weeks2d (0.4SD)
EFW= 2477 g, GA = 35w2d (-0.1SD)

Is this normal especially the BPD? I am worried because it shows smaller than my baby's GA. What does -1.8SD means? Thank you so much.
posted on Sun, 16 Mar 2014
Twitter Sun, 16 Mar 2014 Answered on
Twitter Tue, 18 Mar 2014 Last reviewed on
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Radiologist,  's  Response
Hi,
Thanks for writing in.

BPD measurement depends on many factors including position of the baby. It is not too small for gestational age. It is most likely that the baby is normal and the BPD measurement does not signify any serious problem. As you are in your 35 th week please do not get worried and be in touch with your gynecologist regularly.

The rest of the measurements is normal. I would have liked to see the head circumference measurement also.
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What Does -1.8SD Mean?

Hi, Thanks for writing in. BPD measurement depends on many factors including position of the baby. It is not too small for gestational age. It is most likely that the baby is normal and the BPD measurement does not signify any serious problem. As you are in your 35 th week please do not get worried and be in touch with your gynecologist regularly. The rest of the measurements is normal. I would have liked to see the head circumference measurement also.