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Maternal Serum Screening

Down Syndrome, Trisomy 18 and Neural Tube Defects



Nuchal Translucency (NT)

Slide 8

March 2011

NT measurement is a technically difficult measurement to obtain, therefore can only be performed by certified sonographers. This certification could be obtained by either the Fetal Medicine Foundation or the Nuchal Translucency Quality Review Program.

Mayo Medical Laboratories require that sonographers submit proof of certification prior to submitting measurements for risk estimation. In addition, we request that sonographers submit paired NT and crown-rump length measurements from as many pregnancies as possible in order to determine the NT median to apply to each sonographer when future risk calculations are performed. Selection of the right NT median based on sonographer performance it is important as this will greatly influence the risk calculation.

Nuchal Translucency (NT)

 


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