12 week dating scan accuracy

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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.You will probably be give you a printout of your baby by the sonographer as a keepsake, it is important to remember the main purpose of the scan.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.

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.Accuracy of CRL after 12 weeks in predicting gestational age diminishes and is replaced by measurement of the width of the fetal head (biparietal diameter or BPD).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.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'.

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