Nuchal Translucency Normal Measurements

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Nuchal Translucency

  • Measurement is only valid between 45 and 82 mm
  • In Australia the 1st trimester risk of trisomy 21 is calculated by SAMSAS using markers from maternal serum and a nuchal translucency measurement
  • Tr 21 risk should not be calculated from the nuchal translucency in isolation.
A NT above the 3.5 mm (99%) carries a significantly raised risk of fetal abnormality (especially cardiac abnormalities – prevalence 6%) and poor outcome regardless of the calculated Tr 21 risk - reference: <a class="external" href="http://www.fetalmedicine.com/11-14scanbook/Chapter2/chap02-7.htm" rel="nofollow" target="_blank">http://www.fetalmedicine.com/11-14scanbook/Chapter2/chap02-7.htm</a>


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