If this is a patient with trisomy21, it become more complicated.
如果这病人是21三体,可能就复杂些。
2
Down syndrome (trisomy21) is a disorder caused by the presence of an extra 21st chromosome.
唐氏综合症(21三体综合症)是由于患者额外多了一条21号染色体所致的疾病。
3
CONCLUSIONS: The extent to which free fetal DNA testing can be applied as a universal screening tool for trisomy21, 18, and 13 depends mainly on assay accuracy and cost.