AdventHealth ended its contract with a third-party lab after about 35,000 COVID-19 tests it processed were found to be unreliable, the Altamonte Springs, Fla.-based health system said May 18 in a news ... Becker's Hospital Review: AdventHealth cuts ties with lab after 35K COVID-19 test results were found to be unreliable AdventHealth cuts ties with lab after 35K COVID-19 test results were found to be unreliable