Darian Wisekal, like many women, had a routine Pap smear in 2008. As with many women, the lab work was handled by Laboratory Corp. of America Holdings, a Fortune 500 company and one of the world’s largest clinical laboratory networks.

But that test and another two years later were misread by overworked technicians. Unknown to the Wellington mother, she had a large cervical tumor. She died of cancer at 37 in November 2011.