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The top line represents the skin and bottom one, represents the nasal bone.

A third line, almost in continuity with the skin, but at a higher level, represents the tip of the nose.

If the nasal bone is visible at the scan then this will reduce the chance of your baby having Down's syndrome.

The view of the nasal bone should show three distinct lines: The first two lines, are horizontal and parallel to each other, resembling an 'equal sign'.

It is this black space that you will see measured during the ultrasound scan.

Currently the most accurate non invasive test for detecting Down syndrome during pregnancy is the measurement of the nuchal translucency with an ultrasound between 11 to 14 weeks of pregnancy.

The first Trimester Scan, is Scans are usually performed by a doctors, midwives or radiographers who are specially trained in ultrasound, and are known as sonographers. The amount of liquor (amniotic fluid), the position and appearance of the placenta and a detailed scan of the baby itself.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.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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