Re: Dating of Pregnancy...

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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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