Theranos Faces Growing Number of Lawsuits Over Blood Tests

By Jef Feeley and Caroline Chen, Bloomberg News

Blood-testing startup Theranos Inc. is under legal siege.

After being sanctioned by U.S. regulators, the company now faces at least eight lawsuits filed in federal courts in California and Arizona by patients who claim that faulty blood tests led to heart attacks or other issues. It’s also facing fraud claims in state court in Delaware from one of its investors.

The lawsuits are the latest challenge to the once high- flying startup, which claimed it could run multiple lab tests on a few drops of blood. In July, Chief Executive Officer Elizabeth ...