Nuchal Translucency Normal Measurements

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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