Pregnancy dating

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Occasionally the view is not clear and it may be necessary to perform a vaginal scan.You do not need to have a full bladder, a moderately filled bladder is needed for a proper examination.

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Instead, we most commonly date pregnancies from the first day of the last menstrual period (LMP).Having a scan in pregnancy is usually a happy event, but be aware that ultrasound scans may detect some serious abnormalities, so you should be prepared for that information.See What if a screening test shows a possible problem?That way, regardless of where they trained or where they practice, any two doctors dating a pregnancy will predict the same due date or gestational age.However, the timing of the actual delivery is not so predictable.

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