Quest Diagnostics reports cyber breach affecting ‘certain patient records’

AP ^ | 10/22/2026 | AP

[DFG]

Medical laboratory operator Quest Diagnostics said it learned of a cyber breach of one of its systems this week, likely compromising some records for patients.

In a Thursday regulatory filing, Quest Diagnostics reported “unauthorized access” to its Quanum Lab Services Manager, a platform where certain clients can place test orders and receive or look up their results. The company said it discovered the hack on Wednesday and notified federal law enforcement.

How many patients and which particular records have been affected is still unknown. Quest Diagnostics said it believes “certain patient records” were accessed in the breach, but that the full scope remains under investigation.

The New Jersey-based company said it’s also working with external cybersecurity experts to assist in its response.

Quest Diagnostics has seen hacks impacting patient records before. In 2016, for example, the company said data including lab results and contact information of about 34,000 people was exposed in another online breach. And in 2019, other personal information belonging to about 11.9 million Quest patients was affected after a separate hack at American Medical Collection Agency, a billing collections service provider.

Cyberattacks are on the rise across industries. Beyond healthcare, other breaches have recently disrupted anything from supermarket chains to core education applications.

Governments and companies worldwide are working more broadly on online security updates. Urgency erupted this week, after an AI-assisted discovery of vulnerabilities in a programming language called PHP, which is vital to 70% of websites globally.

Outages and limited service have continued for many as firms rush to patch those risks. But based on the company’s investigation, Quest Diagnostics confirmed to The Associated Press Thursday that its cyber breach was not related to the PHP issue.

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TOPICS: Miscellaneous
KEYWORDS: cyberbreach; hack; patientrecords; questdiagnostics

[frank ballenger]

In the pre-AI past those intrusions into private records were used to do such things as blackmail a politician by saying: “How would your daughter’s fiancé like to know she saw a psychiatrist in college and did community service for a DUI after a campus party? Might spoil her wedding plans for next month. We have the records.”

[Opinionated Blowhard]

Now when they send me a dozen invoices for extra changes 6 or 7 months after I get blood drawn, I won’t pay and them I thought their emails were phishing due to the hacking that resulted from their piss-poor cybersecurity.

[Sarah Barracuda]

Quest Diagnostics is where my mom gets her blood test results from Cedar Sinai its what they use. At most they have access to her medicare number, name and birth date, so if someone does something funky with her medicare she always checks to see if every visit is something she did herself

[Flaming Conservative]

What can be done to prevent Cyber attacks?

[Harpotoo]

Here’s a question, what hasn’t been hacked?

[Merrick]

Gee. I guess they know the results of my thyroid panel.

[monkeyshine]

They’re gonna see my Cholesterol levels!

[CodeToad]

“What can be done to prevent Cyber attacks?”

Fire the indians, stop H1B program, hold executive accountable with jail time.

[Brandonmark]

Went to Quest for Annual Physical. Several days later at office visit with primary care physician, "All of your blood work is in the normal range."

The next day, received this message from Quest: "Something Needs Your Attention We need to bring something important to your attention. After reviewing your recent blood work, we found that some values are not within the expected range. This may indicate a condition that needs prompt evaluation."

Did not respond to link provided and Contacted Quest to no avail,clearly they have problems (or the PCP does).

[butterdezillion]

Any chance hackers could change results?