Non -invasive prenatal testing: ethical issues, March 2017, page 4, http://nuffieldbioethics.org/wp-content/uploads/NIPT-ethical-issues- full-report.pdf. https://www.nidirect.gov.uk/articles/testing-abnormalities says “Blood testing for Down’s syndrome can be carried out between 11 and 13 weeks of pregnancy” accurately and very early in the pregnancy.