Quest Diagnostics has paused its Quanum Lab Services Manager portal, the system some doctors’ offices use to order lab tests and look up results, after finding unauthorized access that it believes reached patient records. Clinics that relied on it are being sent to another Quest portal or told to fax in paper requisitions.

The company learned of the access on Wednesday, according to an 8-K filed Thursday . Quest said it has notified federal law enforcement, engaged outside cybersecurity experts and believes an unauthorized party accessed certain patient records. Asked in a provider FAQ on its incident page whether protected health information or personally identifiable information was involved, Quest answered yes, adding that it is still investigating which data was affected. It has not said how many patients are involved.…