Geisinger Health System's MyCode Community Health Initiative has signed up more than 100,000 participants and has returned results to about 100 patients.
A genetic testing utilization service launched by Stanford in 2015 helped cut the number of inappropriately ordered tests in half and saved about $250,000 during the first year.
The company's 22q11.2 microdeletion test classified almost 0.5 percent of cases as high risk, among them at least 11 true positives and 50 false positives.