Are first trimester ultrsounds accurate dating

First trimester ultrasonic scans may show 'soft' markers for chromosomal abnormalities, such as an increased fetal nuchal translucency (back of the neck) to enable detection of Down's syndrome fetuses.

The test is performed between 11 weeks and 13 weeks 6 days into your pregnancy.

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A scan maybe ordered when an abnormality is suspected on clinical grounds.

The nuchal translucency (also spelled nucal translucency) is a collection of fluid beneath the fetal skin in the region of the fetal neck and this is present and seen in all fetuses in early pregnancy.

Crown Rump Length: Gestational age = 6 weeks plus (CRL x days).

For example, a CRL of 23 mm would correspond to a gestational age of 9 weeks and two days (6 weeks plus 23 days = 9 weeks and 2 days).

You do not need to have a full bladder, a moderately filled bladder is needed for a proper examination.

Most parents look forward to their scan because it gives them the first glimpse of their baby.

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