Prenatal screening/ NT scan and double marker

 Double marker cut off

1: 100 - high risk ---> needs invasive testing

1: 100 to 1: 1000 -----> Intermediate risk--> NIPT

> 1: 1000- Low risk----> Nothing further

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When given intermediate risk, we can send nasal bone to included in risk calculation, if nasal bone is clearly seen.

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Labs ask for FMG certified radiologist to scan, if they have to include nasal bone in risk calculation.