This timeline, compiled by the New England Center for Investigative Reporting, lays out common steps in the prenatal screening process, using an example of a person who conceived around Jan. 1. Screening tests are used to determine whether a developing child is at risk for health problems, but only diagnostic tests can prove with certainty that a disease is present.
An investigation by NECIR found that some companies overstate how accurate their tests are, and don't do enough to help parents and doctors understand the chances that the results could be false alarms.
Read more from the center on the tests.Created with Timeline JS