the "+" calipers should be used for measurement.amniotic fluid should be seen between its back and the uterus this is to not mistakenly measure the distance to the amniotic membrane or uterine wall the fetus should be floating free of the uterine wall i.e.the fetal head should not be extended or flexed.magnification so that only the fetal head and upper thorax are included in the image: enabling 1 mm changes in measurement possible.the fetus must be in the midsagittal imaging plane (the vertebral column should be facing the bottom of the screen) the following structures must be seen to confirm the correct mid-sagittal position:.Use of the correct technique is essential: Nuchal lucency is measured on a sagittal image through the fetal neck. intrauterine infections: Parvovirus B19 is the only specific pathogen with direct relation to increased NT due to the effect of fetal anemia and fetal myocardial infarction.miscarriage or fetal demise: the risk is directly proportionate to increased nuchal translucency thickness and ranges from 1.6% with NT between 95-99th percentile to 20% with NT >6.5 mm 11. ![]() Noonan syndrome: the only genetic molecular condition with a clear association with increased nuchal translucency. ![]()
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