PREGNANCY-BIRTH Messages for February, 1999: Re: baby size on US

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Re: baby size on US

From: William D. McIntosh, MD (anonymous@obgyn.net)
Tue, 16 Feb 1999 17:24:39 -0600 (CST)

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In reply to: AMD: "baby size on US"

At Tue, 16 Feb 1999, AMD wrote: >
>I had my US last week at 19 weeks. The estimate for the baby's size was
>383 grams. How accurate are US measurements for size? I did the math
>and calculated this is approximately equal to 12 1/2 ounces. All my
>baby books say this is the typical size at 22 - 23 weeks. The US dated
>my pregnancy at about 20w4d. I am pretty sure of my dates since I was
>using BBT. Does 383 grams seem unusually big for 19-20 weeks? Is there
>any problem with the baby being big at this point?
>
>Thanks,
>Andrea

That is well within the normal range for 19 weeks. U/S is not accurate like a scale. It is at best a guess for weight. My U/S actually gives 3 weights, all calculated a bit differently, with as much as 75 grams difference at this gestational age.

-- William D. McIntosh, MD Clarksville, TN

This is for educational purposes only. It is not intended to replace consultation and examination by your physician or other health care provider.

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