Researchers note that many sources of errors associated with diagnostic testing involve how providers order tests and how specimens are handled
ECRI (Emergency Care Research Institute), a non-profit organization that focuses on healthcare quality and patient safety, has released results from a study which lays blame for most diagnostic errors on systemic issues that arise during clinical laboratory, radiology, and other diagnostic testing processes. These issues relate to “ordering, collecting, processing, obtaining results, or communicating results,” the organization stated in a news release.
“It’s a common misconception that if a patient has a missed or incorrect diagnosis, their doctor came up with the wrong hypothesis after having all the facts,” said ECRI President and CEO Marcus Schabacker MD, PhD, in the news release. “That does happen occasionally, but we found that was tied to less than 3% of diagnostic errors. What’s more likely to break the diagnostic process are technical, administrative, and communication-related issues. These represent system failures, where many small mistakes lead to one big mistake.”
The researchers based their analysis on reports of adverse patient safety events and “near-misses” submitted to ECRI and the Institute for Safe Medication Practices (ISMP) in 2023. Healthcare providers submitted the data from across the US, ECRI noted.
From a total of 3,014 patient safety events, ECRI determined that 1,011 were related to diagnostic errors. Then, it sorted the events based on “the appropriate step in the diagnostic process where the breakdown occurred,” according to the news release.
ECRI did not reveal how many errors were related to clinical laboratory testing as opposed to radiological or ultrasound imaging.
“The problem of diagnostic safety comes down to the lack of a systems-based approach,” said ECRI President and CEO Marcus Schabacker MD, PhD (above), in a news release. “Since there are multiple potential failure points, a single intervention is insufficient.” Diagnostic errors can also include imaging/radiology and other types of diagnostic procedures—not just clinical laboratory tests. (Photo copyright: ECRI.)
Where Errors Occur
According to ECRI’s analysis, the largest number of errors by far (nearly 70%) happened during the clinical laboratory testing process. Among these, “more than 23% were a result of a technical or processing error, like the misuse of testing equipment, a poorly processed specimen, or a clinician lacking the proper skill to conduct the test,” ECRI stated. “Another 20% of testing errors were a result of mixed-up samples, mislabeled specimens, and tests performed on the wrong patient.”
Outside the testing process, other errors occurred during monitoring and follow-up (12%) and during referral and consultation (9%).
One major factor behind diagnostic errors, ECRI noted, was miscommunication among providers and between providers and patients.
The organization also cited “productivity pressures that prevent providers from exploring all investigative options or from consulting other providers” as leading to diagnostic errors.
In some cases, providers who ordered lab tests delayed reviewing the results or the patients were not notified of the results.
“Referrals to specialists or requests for additional consultations can complicate the process, presenting more potential failure points,” ECRI noted.
Troubling Imaging Anecdotes, Previous Studies
The ECRI news release cites two de-identified patient stories, both related to imaging. One case involved a woman who “experienced abdominal pain and abnormal vaginal bleeding,” but a diagnosis of uterine cancer was delayed nearly a year. “MRIs were ordered, but not all the results were reviewed, as her symptoms worsened. Despite masses being detected on an ultrasound, a missed appointment and communication barriers delayed her diagnosis. She was finally diagnosed after severe pain led to hospitalization.”
In one “near-miss” incident, a patient did not receive an essential carotid ultrasound procedure prior to being scheduled for open-heart surgery. Staff caught the omission and canceled the surgery. A later ultrasound “revealed he would have had a catastrophic surgical outcome if the surgery had proceeded as scheduled,” ECRI stated.
Two earlier studies noted in the news release highlight the impact of diagnostic errors.
A 2017 study, published in the journal BMJ Quality Safety, estimated that diagnostic errors affect approximately 5% of US adults—a total of 12 million—each year. In that paper, the authors combined estimates from three observational studies that defined diagnostic error in similar ways.
“Based upon previous work, we estimate that about half of these errors could potentially be harmful,” the authors wrote.
And a 2024 study published in the same journal estimated that 795,000 Americans die or become permanently disabled each year due to misdiagnosis of dangerous diseases. “Just 15 diseases account for about half of all serious harms, so the problem may be more tractable than previously imagined,” the authors wrote.
Recommendations for Providers, Labs
ECRI advised that healthcare providers should adopt a “total systems safety approach and human-factors engineering” to reduce diagnostic errors. This is good advice for clinical laboratories as well.
Specific steps should include “integrating EHR workflows, optimizing testing processes, tracking results, and establishing multidisciplinary diagnostic management teams to analyze safety events,” the news release states.
Schabacker also advised patients to “ask questions to understand why their doctor is ordering tests, and are those tests urgent,” he said. “Schedule your appointments and tests quickly and follow up with your provider if you’re awaiting results. If possible, ask a family member or friend to join you in important appointments, to help ask questions and take notes.”
Clinical laboratory managers have been alerted to the involvement of lab testing in incidents of medical errors. This report by ECRI is more evidence of the gaps in care delivery that often contribute to medical error. Medical lab professionals may want to review the ECRI report to learn more about what the authors identify as the specific breakdowns in care processes that contribute to medical errors.
Clinical laboratories can play a critical role in helping doctors to order correct tests and interpret the results
Nearly 800,000 Americans die or are permanently disabled each year due to diagnostic errors. That’s according to research conducted at Johns Hopkins School of Medicine that found most misdiagnoses are due to cognitive errors on the part of the treating physicians. Many diagnoses typically begin with–and are often achieved through—clinical laboratory testing. For that reason, the range of diagnostic errors identified in this study will interest pathologists and lab managers.
Of course, many types of diagnostic errors have nothing to do with lab tests. That said, the research team noted that some diagnostic errors take place when physicians do not pay attention to test results that indicate a patient is not doing well, or do not understand the significance of the test results. There are also examples where doctors order the wrong lab tests for patients’ symptoms.
The Johns Hopkins study findings were published in the journal BMJ Quality and Safety titled, “Burden of Serious Harms from Diagnostic Error in the USA.” The research team determined that only 15 diseases “accounted for 50.7% of total serious harms” and nearly 40% of those harms involved just five medical conditions:
These can be narrowed down even further to just three categories, the researchers noted in BMJ Quality and Safety. They are:
Major vascular events,
Infections, and
Cancers.
In an interview with CNN Health, lead author of the study David Newman-Toker, MD, PhD, a neurology professor at Johns Hopkins and Director of the Division of Neuro-Visual and Vestibular Disorders, said “These are relatively common diseases that are missed relatively commonly and are associated with significant amounts of harm.”
“We focused here on the serious harms, but the number of diagnostic errors that happen out there in the US each year is probably somewhere on the order of magnitude of 50 to 100 million,” neurologist David Newman-Toker, MD, PhD (above), professor and Director of the Division of Neuro-Visual and Vestibular Disorders at Johns Hopkins, who led the study, told STAT. “If you actually look, you see it’s happening all the time.” Clinical laboratories play a key role in ensuring correct understanding of the tests they perform. (Photo copyright: Johns Hopkins University.)
Changes to Healthcare Risk Management
According to Newman-Toker, the Johns Hopkins study is “the first population health estimate of the number of patients seriously harmed. It also provides more information about the distribution of the diseases that are involved,” Relias Media reported.
The sheer volume of this issue is not lost on the researchers. Newman-Toker likens it to measuring an iceberg.
“You dive below the surface, and you measure the circumference of the iceberg, and [you] will say, ‘Oh my gosh, it’s really big down here.’ And then you go five more feet, and you measure the circumference, and it keeps getting bigger. By the time you’re 20 feet below the surface, you realize this is huge,” he told Relias Media.
Newman-Toker believes his team’s research offers an opportunity for physicians and healthcare risk managers to better understand how exactly to prioritize their resources and focus their efforts. “In terms of how it informs their day-to-day decision-making, it really is rebalancing some of the efforts a little bit in the direction of conditions that are more common and more commonly misdiagnosed than perhaps indicated by simply looking at claims data,” he noted.
Vascular events can present in symptoms typical of much less serious conditions. Strokes, for example, can present with vague symptoms such as a headache or dizziness. This is similar to heart attacks, which can just present as chest pains. However, heart attacks are far less misdiagnosed than strokes because of a decades-long effort to eradicate those diagnostic errors.
“Diagnostic errors are errors of omission,” Daniel Yang, MD, an internist and Program Director for the Diagnostic Excellence Initiative at the Gordon and Betty Moore Foundation, told CNN Health. “The question is: Could [the outcome] be prevented if we had done something differently earlier on? Oftentimes, that’s a judgment call that two doctors might disagree on.”
Physicians and risk managers can work together to determine the best course of action to identify vague symptoms and prevent the deaths and serious injuries that can come from diagnostic errors.
“A patient comes into the ED with a headache or dizziness, and they get told it’ll go away, and then they go home. And then a week later, you find out that they [had] a stroke,” he explained. “By then, the stroke has compounded so much that what could have been addressed in the moment … for $10,000 now becomes a $100,000 issue. … So, there’s a margin of $90,000 that has been added to the US health system burden because of the misdiagnosis.”
Padula estimates that the total cost for these misdiagnoses could come to as much as $100 billion on the healthcare system.
What’s the Solution?
How can physicians avoid misdiagnoses and keep their patients safe? Newman-Toker suggests that physicians consult with other doctors. “I believe that the quickest way to solve the diagnostic error problem in the real world would be to construct approaches that basically rely on the ‘phone a friend’ model,” he told STAT News.
“This doesn’t mean that the patient should have to seek a second opinion, but rather that providers should make it standard practice to consult with a colleague before providing a diagnosis or dismissing a patient,” STAT News added.
Clinical laboratory professionals should note that while these misdiagnoses do not take place in the lab, doctor may order incorrect tests for patients by misreading their symptoms. Thus, clinical pathologists and lab scientists can play a critical role in helping doctors to order the correct tests for their patients and accurately interpret the results.
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