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Don't forget to download our free app for a day-by-day guide to your pregnancy. Most practices will report whether the nasal bone is present or absent, but they will not be able to incorporate the nasal bone into the risk assessment. Nuchal dating scan the same time, the sonographer will check to see whether a nasal bone is visible on the scan. Most parents look forward to their scan because it gives them the first glimpse of their baby. Family holiday planning Going on holidays will never be the same again. This is normally less than 2. Check here nuchal dating scan alerts. It is important to recognise that many radiology practices continue to use the older classification system of simply low risk risk less than 1 in and high risk risk greater than 1 in For Edwards' and Patau's syndromes, if you are too far into your pregnancy to have the combined test, you'll be offered a mid-pregnancy scan. I did my 13 weeks NT scan test and its result was 2. 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. These levels may indicate a higher risk of chromosomal abnormalities. What happens during a nuchal scan and what do they measure? Further investigations will be recommended for anyone with a risk higher than 1 in although some NHS trusts use 1: It is the least accurate screening test for Down syndrome. The whole pregnancy will be assessed.