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A nuchal translucency scan (also called a first trimester pregnancy screening scan) is usually offered to pregnant women between 11 and 13 weeks.This scan is done in combination with blood tests to determine the baby’s risk of having certain chromosomal abnormalities, such as Down syndrome.
The due date can also be confirmed during a nuchal translucency scan or 18-20 week pregnancy screening scan – see below.The ultrasound looks specifically at the fluid space at the back of the baby’s neck.If the combined test indicates a higher than normal risk, you will be offered further tests.If the ultrasound scan detects a problem, having the information early is often important. Inside Radiology: 18-20 week screening pregnancy ultrasound (published ). In some situations where a problem is detected during ultrasound, there may be treatments that can be undertaken or planned for while you are still pregnant. Royal Australian and New Zealand College of Radiologists.