Nuchal dating scan nhs
The scan is obtained with the fetus in sagittal section and a neutral position of the fetal head (neither hyperflexed nor extended, either of which can influence the nuchal translucency thickness).The fetal image is enlarged to fill 75% of the screen, and the maximum thickness is measured, from leading edge to leading edge.
This method identifies about 75% of affected fetuses while screening about 5% of pregnancies.
The translucent area measured (the nuchal translucency) is only useful to measure between 11 and 14 weeks of gestation, when the fetal lymphatic system is developing and the peripheral resistance of the placenta is high.
After 14 weeks the lymphatic system is likely to have developed sufficiently to drain away any excess fluid, and changes to the placental circulation will result in a drop in peripheral resistance.
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