Outcome data for 5 years of invasive prenatal diagnostic testing
| Abnormal ultrasound scan | 41 (38.6%) |
| Positive Down's screening | 26 (24.4%) |
| Maternal request | 21 (19.8%) |
| Others; DNA analysis etc | 18 (16.8%) |
| The major groups of abnormalities were: | |
| Down's syndrome | 42 (39.6%) |
| Other trisomies | 22 (20.7%) |
| Translocations | 28 (26.5%) |
| Others; DNA etc | 13 (12.2%) |