Nt scan and sex: NT is the ultrasound appearance of neck tissue in the first 3 months of a pregnancy. In a study of 56,000 pts, for an unknown reason, the neck in females is about 10% thinner. http://s3.amazonaws.com/publicationslist.org/data/kevinspencer1/ref-184/pnd2009_29_578_581.pdf The measurement is to exclude Down's, not for sexing. Most reliable is to wait until you can see a penis later in the pregnancy.
Answered 4/12/2018
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