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Posted on April 20, 2026 written by Jane Paulson
Medical testing plays a central role in diagnosing conditions and guiding treatment decisions. When those results are wrong or delayed, the consequences can be serious. Many patients in Portland rely on accurate lab work without realizing how often mistakes can occur behind the scenes. At Paulson Coletti, we have seen how common medical laboratory errors can affect health outcomes and cause lasting harm, especially when they go unnoticed.
Studies show that a large percentage of laboratory mistakes occur before testing even begins, often during sample collection and preparation. Issues such as mislabeled specimens, improper handling, or inadequate patient preparation are among the most frequent causes, and many of these errors are preventable when proper systems and training are in place.
Working with a Portland medical malpractice lawyer can help clarify whether a diagnostic failure may be tied to preventable mistakes in the testing process.
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One of the most concerning laboratory errors involves mislabeling or mixing up patient samples. Even a small identification mistake can result in test results being assigned to the wrong person, leading to confusion and potentially dangerous medical decisions.
This type of breakdown often occurs during high-volume processing, when staff may be rushed, or systems lack adequate verification steps. A mislabeled sample can trigger unnecessary treatments or delay care for the person who truly needs it.
When a patient receives results that do not belong to them, the outcome can quickly escalate into a misdiagnosis. Physicians rely heavily on lab findings to determine the next course of action, and inaccurate data can lead to inappropriate medications, procedures, or interventions.
In some situations, the real condition remains untreated while attention is focused on an incorrect diagnosis. Over time, this delay can worsen the underlying illness and complicate recovery.
Laboratory equipment must be properly maintained and calibrated to ensure accurate readings. When machines are not functioning correctly, even correctly collected samples can produce unreliable results.
According to the National Library of Medicine, laboratory inaccuracies can stem from equipment failures, insufficient quality control, or lack of routine calibration, all of which increase the likelihood of diagnostic errors.
These failures can lead to false positives or false negatives, both of which carry serious consequences. A false negative may delay necessary treatment, while a false positive can expose a patient to unnecessary procedures.
Contamination is another source of error that can compromise test results. During collection, storage, or transport, samples may be exposed to substances that alter their integrity.
For example, improper sterilization techniques or environmental exposure can introduce foreign elements into a sample. Once contamination occurs, the test’s reliability is significantly reduced.
These errors are often preventable with proper protocols, yet lapses in procedure continue to occur in busy healthcare environments. In many cases, these types of issues fall within broader patterns of common medical laboratory errors that can directly affect the accuracy of diagnostic results.
Timely communication of lab results is essential for effective treatment. Delays in reporting can prevent physicians from responding quickly to serious conditions.
In urgent cases, even a short delay may affect the outcome of care. Conditions that require immediate attention, such as infections or internal complications, can worsen when treatment is postponed.
When delays occur due to administrative oversight or system inefficiencies, patients may face unnecessary risks that could have been avoided.
Effective communication between laboratory staff and healthcare providers is critical. When information is incomplete, unclear, or delayed, the risk of error increases.
Breakdowns may involve missing test details, unclear reporting formats, or failure to notify providers of abnormal results. These gaps can lead to misunderstandings that impact clinical decisions.
Clear communication protocols are essential to ensure that critical information is delivered accurately and promptly.
Not every mistake rises to the level of malpractice. Still, when a laboratory error stems from negligence and leads to harm, it can form the basis of a legal claim.
Under Oregon Revised Statutes Chapter 677, healthcare providers are expected to follow established standards of care. When those standards are not met, and a patient is harmed as a result, legal responsibility may arise.
To move forward with a claim, it is necessary to show that the error could have been avoided and that it directly caused the injury. This usually involves demonstrating that a provider owed a duty of care, failed to meet that obligation, and that the failure led to measurable harm. In laboratory settings, this often comes down to identifying preventable breakdowns in labeling, testing procedures, or communication. A careful review of medical records, lab protocols, and communication timelines can help clarify how the mistake influenced diagnosis, treatment decisions, and the patient’s overall outcome.
When a laboratory mistake leads to serious consequences, understanding your options becomes important. A careful review of your medical history and diagnostic process can reveal whether negligence played a role.
At Paulson Coletti, we work with individuals and families affected by preventable medical errors. If you suspect that a common medical laboratory error contributed to your condition, our team can help evaluate your situation and explain the next steps. Call 503-226-6361 to discuss your case and learn how we may assist you.
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This page has been written, edited, and fact-checked by our team of legal writers in accordance with our editorial guidelines. It has been approved by partners Jane Paulson and John Coletti—respected trial attorneys with decades of experience representing personal injury victims.
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