Increased NT
Management of NT below 3.5 mm
Chorion villous sampling (CVS): the decision by the parents in favour or against fetal karyotyping will depend on the patient-specific risk for chromosomal defects, which is derived from the combination of maternal age, sonographic findings and serum free ß-hCG and PAPP-A.
- A detailed scan should be carried out at 11-13 weeks and again at 20 weeks in search of major abnormalities.
- If no obvious abnormalities are seen the parents should be reassured that their baby is likely to be live born and develop normally. The chances that there would be any problems are not higher than in fetuses without increased NT.
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