If you are pretty certain you will go ahead with a CVS or amnio, to get a definitive answer, do you want to go through with the NT scan and blood tests?
Your risk figure based on age is roughly 1 in 100 (or 1 in 75 by amnio). If the result from NT scan gave you a risk of 1 in 150, would you still want a CVS/amnio? What is the result was 1 in 500 or 1 in 25? Would these results change your decision? Would they make you more anxious if the risk was greater?
It sounds like you guys want a definitive answer through CVS or amnio, and the NT scan might confuse the situation or add unneccessary anxiety where the diagnostic test can give you the answer you are looking for.
CVS or amnio are available to women over the age of 37 without having the NT scan.
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