Fig 1.
Flowchart of four screening strategies.
NIPT, noninvasive prenatal testing; IPD, invasive prenatal diagnosis.
Table 1.
List of Serum screening results.
Table 2.
List of Noninvasive prenatal testing results.
Table 3.
Serum screening and fetal karyotype of cases at high risk in noninvasive prenatal testing.
Fig 2.
Comparison of various indicators in the statistical results of NIPT and SS.
Table 4.
Costs of DS screening with four screening strategies.