Dating scan nuchal scan

The first method of screening for Down syndrome introduced in the 1970s was the use of maternal age.Any woman above the age of 35 was offered amniocentesis.Your choice of a free rescan may be appropriate if we are unable to perform the primary purpose of this scan.

Your midwife may recommend an early scan at between six weeks and 10 weeks if you have experienced bleeding, pain, or problems in a previous pregnancy.

Dating scans are the most accurate way of predicting your due date.

The whole point of the scan is to work out how many weeks pregnant you are.

However, increased nuchal translucency measurements are also associated with non-chromosomal abnormalities such as genetic conditions (e.g. There are two distinct measurements – the nuchal translucency, which is measured earlier in pregnancy at the end of the first trimester, and for which there is a lower threshold for increased diameter, and the nuchal fold, which is measured towards the end of the second trimester.

The scan may also help confirm both the accuracy of the pregnancy dates and the fetal viability.

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A large number of women underwent amniocentesis and 70% of Down syndrome babies that were born to younger women were missed.

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