Wie lange dauert die NT Messung?
Die Nackentransparenzmessung ist eine gewöhnliche Ultraschalluntersuchung. In der Regel erfolgt sie durch die Bauchdecke. Liegt das Baby so, dass es nicht gut zu sehen ist, kann die Untersuchung auch vaginal per Ultraschall durchgeführt werden. Die Nackenfaltenmessung dauert etwa fünf bis zehn Minuten.
Wie wird eine NT Messung durchgeführt?
Bei der sogenannten Nackenfaltenmessung oder Nackentransparenzmessung (NT-Messung, NT-Screening) wird diese Nackenfalte anhand einer Ultraschallaufnahme an ihrer breitesten Stelle gemessen. Die Ultraschalluntersuchung kann über die Bauchdecke (abdominal) oder über die Vagina (vaginal) erfolgen.
What is a normal nuchal translucency measurement?
What is a normal nuchal translucency measurement? An NT of less than 3.5mm is considered normal when your baby measures between 45mm (1.8in) and 84mm (3.3in). The NT usually grows in proportion with your baby. The images below give an idea of what different levels of NT look like. A baby with an NT of 1.3mm is within the normal range.
What does it mean if my NT is high?
Therefore, the increased measurement of the NT can show the baby has chromosome abnormalities like Trisomy 13, 18 and 21 or structural issues like abnormalities of the heart. However, this does not mean the baby will have a problem. It only means the risk is higher. This condition means a baby has an extra chromosome 21 in every cell of their body.
Can a baby have Down’s syndrome with a normal NT measurement?
Nine out of 10 babies with a measurement between 2.5mm and 3.5mm will not have Down’s syndrome. As the NT increases, so does the chance of Down’s syndrome and other chromosomal abnormalities. The baby with an NT of 6mm has a high chance of Down’s syndrome, as well as other chromosomal abnormalities and heart problems.
What are the chances of a false positive NT scan?
Sometimes, a scan can suggest that a baby has a high chance of having Down’s syndrome, even though the likelihood is actually low. This is called a false positive. The false-positive rate for an NT scan is five per cent.