![]() 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.
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