The number is much higer, the 834,233 is not the total number of incorrect results. It is the number Theranos formally invalidated or revised. Theranos performed many tests using conventional laboratory equipment rather than its proprietary Edison machines. The company initially voided results from Edison devices and subsequently corrected other results. But conventional equipment did not guarantee accurate results, because Theranos also had problems with its laboratory procedures.

In November 2021, a woman named Erin Tompkins testified in Elizabeth Holmes's trial that Theranos had given her a false-positive HIV result in 2015