Quest Diagnostics down after cyber incident disclosure

** Quest Diagnostics DGX.N shares down 2.9% to $231.90 premarket

** Co says it has learned of unauthorized access to its Quanum LSM system, which certain clients use to place test orders, receive and look up results

** While the full scope of unauthorized access remains under investigation, at this time DGX believes that an unauthorized party accessed certain patient records

** Adds the incident has not materially disrupted its business operations or its ability to serve patients

** Separately, co now expects annual rev to be between $12.07 billion and $12.11 billion vs $11.95 billion to $12.05 billion expected previously

** Raises annual adj EPS view to be between $11.25 and $11.35 from $9.97 and $10.17

** Up to last close, stock up 37.5% YTD