How ‘non-invasive’ is non-invasive prenatal testing?

The invasiveness of a medical intervention is considered to be morally important and can have a significant influence on acceptability and uptake. De Marco et al propose a novel account of the invasiveness of medical interventions that better reflects the common understanding of the term. Using the example of non-invasive prenatal testing, I develop this account and argue that comparisons should only occur between medical interventions of clinically and morally significant differences.