WOMENS-HEALTH Messages for November, 1997: Re: Accuracy of Second Trimester Ultrasounds

Re: Accuracy of Second Trimester Ultrasounds

From: Harvey S. Marchbein, M.D. (anonymous@obgyn.net)
Fri, 14 Nov 1997 09:45:02 -0600 (CST)

Messages sorted by: [ date ][ thread ][ subject ][ author ]
Next message: Harvey S. Marchbein, M.D.: "Re: Endometriosis and Mold"
Previous message: Harvey S. Marchbein, M.D.: "Re: EDEMA"
In reply to: Mary: "Accuracy of Second Trimester Ultrasounds"
Next in thread: Stormy: "Re: Accuracy of Second Trimester Ultrasounds"

At Fri, 14 Nov 1997, Mary wrote: >
>I understand that early first trimester U/S is most accurate for dating
>a pregnancy and that late 3rd trimester U/S is less accurate for
>estimating fetal size.
>
>How accurate is second trimester U/S for estimating fetal size?

In between 1 and 3. No, really. It is.

>My situation: U/S at 20 weeks - femur, humerus, hand, foot, abdominal
>circumference and BPD measurements all indicate 21.5-22.5 week size.
>(LMP and conception dates are known.) Fetal weight was estimated at
>16-18oz.
>
>>From what I have read, fetal size at 20 weeks is usually 10-12 ozs.
>
>Does the result of the U/S accurately reflect a large baby (or shall I
>say ANOTHER large baby - my son was over 11lbs)?

Maybe. Too early to tell. EFW (estimated fetal weight) is *give or take 10-15%* Size measurements have a 7-10 day variability so it's pretty close to what you got.

>Also, no indication of GD at this time. 3hr GTT in Sept was normal.

For our listeners around the country, GD is gestational diabetes. If a big baby was had in a last pregnancy, a 3 hour GTT should be done first trimester (as soon as it can be arranges) and in the late second/early third trimester also. 11# babies ARE BIG!!

>Thanks for any opinions on this.

>Katherine Marie...due March '98

I guess Katherine Marie Harvey would be asking too much just for answering a few questions 8-)

--
Harvey S. Marchbein, M.D. FACOG, FACS
OBGYN.net U.S. Representative, New York
Great Neck, New York
http://www.obgyn.net/states/bios/marchbein.htm
http://www.obgyn.net/women/advisors/harveym.htm

*Note:  Opinions expressed here are for educational purpose only.
This information is not intended to supplant the need for you to
consult with your physician prior to choosing therapeutic options.

**Private emails cannot be entertained due to time constraints,
consequently no private emails will receive a response.
**Thank you for your understanding ;-)

Next message: Harvey S. Marchbein, M.D.: "Re: Endometriosis and Mold"
Previous message: Harvey S. Marchbein, M.D.: "Re: EDEMA"
In reply to: Mary: "Accuracy of Second Trimester Ultrasounds"
Next in thread: Stormy: "Re: Accuracy of Second Trimester Ultrasounds"

use when must restrict search to only the women's health forum...
Enter search keywords:
	Returns per screen: Require all keywords: