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Re: Dating of Pregnancy...

From: anonymous@obgyn.net
Sat, 2 Jan 1999 19:28:26 -0600 (CST)

At Thu, 12 Nov 1998, Dr. wrote: >
>>I had an u/s at 5.4 wks since my last period and nothing was seen, I
>>then had another u/s at 6.3 wks and a gestational sac was seen. How
>>many weeks since conception would this be and how accurate is it?
>I am 41 years old and had my first ultrasound at 11.5 weeks. They fetus was approximately 2 inches long and they told me that the placenta and heartbeat were "where and what they should be". I have only been pregnant once before, 10 years ago, and lost the fetus at 9 weeks. I have heard that it is possible to purchase a "doppler" device to check the baby's heartbeat from home. Based on my history and age, I thought this might help in reducing some of my anxiety. I am scheduled for an amnio (I will be 16.5 weeks) on January 21st. Is a doppler a viable option or should I just wait until the 21st. Many thanks.

Beth

>Dear Lynn
>
>the short answer is that neither of these scans can date your pregnancy.
>The long answer is more complex. If your cycle is 28 days (give or
>take) then it would be normal to find an early fetus at about 6-7 weeks
>from beginning of LMP and be able to see a beating fetal heart (with
>good equipment, a thin mother and a good sonologist!) when scanned
>transabdominally. If scanned vaginally you would hope to see the same
>up to week earlier.
>If your cycle is longer then the scan findings would be seen later
>depending on the length of your cycle. If your cycle is 35 days the
>scan will take a further week before you would see the same things.
>
>Once a fetal pole is seen, the crown rump measurement will give an
>estimate of the gestation to within 7-10 days. If your dates are
>certain and your cycle is regular AND the crown rump length is within 10
>days of your dates I would go with your dates.
>
>Hope it works out well.
>
>--
>Ross Welch
>Consultant in Fetomaternal medicine
>Duchess of Westminster Wing
>Arrowe Park Hospital
>Upton, Wirral.
>UK
>
>Current president International Fetal Medicine and Surgery Society.
>

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