nuchal scan
(zoology) Any freshwater snail in the family Stenothyridae.
(uncommon) Synonym of folkloric
The condition of being heteroplasmic
An ultrasound performed on a pregnant woman to help determine the chances that the foetus may develop chromosomal conditions such as Down syndrome.
産科医は胎児がダウン症などの染色体疾患を発症するリスクを評価するため、12週で頸部透明帯検査（NT検査）を勧めました。
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