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The objective of this study was to explore different approaches to communicating the positive predictive value (PPV) of cell-free DNA screening for fetal trisomy. PPV was established for 4 maternal age-groups (30, 30-34, 35-39, and 39 years) from clinical laboratory data and compared to the modeled PPV from an online calculator. In women under 35, PPV was compared between 2 subsets, high risk and low risk, classified based on the diagnosis codes that were provided to the laboratory. In 503 high-probability trisomy 21 results, th