Quest Diagnostics, which operates medical laboratories, has announced that 34,000 customer records were exposed during a hacking incident that occurred on November 26th. The hacker obtained access to the information through an internet application on Quest’s network.

The compromised information includes patient names, dates of birth, lab results, and some telephone numbers. No Social Security numbers or financial information was exposed.

Quest will notify affected patients by mail and have established a toll free number for patients with questions.