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First of all, the timing of this particular scan is very important.

This apparent inconsistency of increased incidence without persistence that Clapp noted was probably related to widely space ultrasonographic evaluations 3—6 weeks and limited sampling times 5—10 min.

The purpose of this study was to determine the immunoreactivity of selected structural proteins in the preterm and near-term ovine fetal brain and the response to intermittent umbilical cord occlusion as a measure of altered cellular growth.

Vagal collapse results from pressure to the carotid sinuses and increased parasympathetic tone.

Nuchal fold can be spuriously thickened by angling caudally intersecting the inferior level of the cerebellum and occiput.

A nuchal translucency scan is usually combined with other testing like maternal serum screening.

NT is the first-trimester analog of the second-trimester nuchal fold Figure 25-8.

The NT grows in proportion to the baby.

Who should get a nuchal translucency screening? Also keep in mind that a normal result on a screening test is not a guarantee that your baby does not have a chromosomal defect, although it does mean that it's very unlikely.

NT results by themselves have an accuracy rate of about 70 percent.

In a combined screening, NT ultrasound results are paired with one or two blood tests that measure and compare your levels of hCG and PAPP-A pregnancy associated plasma protein A.