Table 1 The prenatal diagnostic indications of 570 pregnant women
| Prenatal diagnostic indications | Cases(%) |
|---|---|
| Advanced maternal age | 328 (57.54%) |
| Serological screening high-risk value | 78 (13.68%) |
| Serological screening critical-risk value | 2 (0.35%) |
| Other indications | 162 (28.42%) |
| Total | 570 (100.00%) |