Prenatal diagnosis tests and women’s risk perception : a cross-sectional study

Objective: To investigate women’s decision to undergo non-invasive and/or invasive tests for prenatal diagnosis depending on the procedure-related risk and the risk of carrying a foetus with Down syndrome (DS). Both risks are rated in terms of numerical relevance and acceptability. Method: A sample of 448 consecutive women with low-risk pregnancies were interviewed to collect social and clinical variables and to determine their perceptions of the risks of invasive procedure-related miscarriage and carrying a foetus with DS. The risks were scored numerically in terms of their relevance and acceptability using a 10-point rating scale. Results: The factors related to the use of non-invasive tests were age ≥35 years, not being treated at a public service, rating the risk of carrying a foetus with DS as having high numerical relevance and low acceptability, and rating the risk of miscarriage as having high acceptability. These relationships were still present when the use of invasive tests was considered, except in terms of the numerical relevance of the risk of carrying a foetus with DS. Conclusion: Perceived acceptability affects the interpretation of a given risk more than the numerical relevance of the risk.