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Indications for prenatal diagnosis of the pregnant women enrolled in the study
| Indications | Number (%) |
|---|---|
| Positive screening results for advanced maternal age, serum screening and/or NIPT | 2782 (64.92) |
| Abnormal ultrasound findings | 856 (19.97) |
| Family history of intellectual disability | 36 (0.84) |
| Chromosome abnormality | 76 (1.77) |
| Previous adverse pregnancy outcome | 35 (8.26) |
| Monogenic disease carrier (thalassemia, haemophilia, PKU, etc. except FXS) | 157 (3.66) |
| Others | 25 (0.58) |
| Total | 4286 |
