It is your choice whether to have a NT measurement +/- maternal blood tests, just as it your choice to have or not have further testing. Doctors may encourage you to have further testing but it should be your decision and at a time when you are comfortable with it.Not sure how high it goes up to but anything under 1/300 is considered high risk and further investigations should be carried out.
The 1/300 risk being "high risk" is based on the predicted incidence of miscarriage following the next round of testing (CVS or amnio) and cost-benefit calculations. There is no medical reason why this 1/300 figure is used.
Like this thread shows, one risk value can be interpreted in different ways by different people based on their circumstances. To some the value will seem really high, to others the same value will be low.




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