Zachary Diamond and Angie Nunes look at their "wonderfully healthy" 6-month-old son Solomon, knowing they might have terminated the pregnancy — all because of a popular prenatal test that was wrong. The Portland, Oregon, couple was encouraged to use a new noninvasive blood test that their doctor said was "99 percent" accurate in predicting chromosomal abnormalities. The test revealed the fetus had Trisomy 18 or Edwards syndrome, a painful genetic condition that is nearly always fatal, and their doctor told them to prepare for the worst. "If you google Trisomy 18, your heart will just shatter with the prognosis," Diamond,...