| Methods | Random selection (method unknown). | |
| Participants | 44 women between 9 and 12 weeks of gestation. | |
| Interventions | Transcervical CVS with ago-cannula or transabdominal procedure with a spinal needle (gauge size unknown) and a suction pistol | |
| Outcomes | Sampling failure, vaginal spotting and amniotic fluid leak, pregnancy loss | |
| Notes | ||
| Risk of bias | ||
| Item | Authors’ judgement | Description |
| Allocation concealment? | Unclear | B - Unclear |
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