NT NB scan is a screening test. It gives a percentage or probability of having a normal or abnormal baby.
After this you will have a Quad Test at 18-19 weeks. That will give a better index of probability of a normal or abnormal baby. Based on the Quad test you may be advised for NIPT or amniocentesis , or no further investigations.
So it is a step by step assessment.
Answered2024-10-01 11:48:14
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