False Positive Laboratory Results Medical Malpractice in Chicago

A false positive laboratory result tells you that you have a disease or condition you do not actually have. For patients in Chicago, that single error can set off a chain of harmful events, from unnecessary surgeries and toxic medications to severe emotional distress and financial ruin. When a false positive happens because a lab technician, pathologist, or treating physician failed to meet the accepted standard of care, the patient may have a viable medical malpractice claim under Illinois law. At Briskman Briskman & Greenberg, a Chicago personal injury lawyer from our team can review what happened to you and explain your legal options at no cost.

Table of Contents

• What a False Positive Laboratory Result Means and Why It Causes Serious Harm
• How False Positive Lab Errors Happen in Chicago Hospitals and Laboratories
• Proving Medical Malpractice from a False Positive Lab Result Under Illinois Law
• Who Can Be Held Liable for a False Positive Lab Result in Chicago
• Illinois Deadlines for Filing a False Positive Lab Result Malpractice Claim
• What Compensation You Can Seek After a False Positive Lab Error in Chicago
• FAQs About False Positive Laboratory Results Medical Malpractice in Chicago

What a False Positive Laboratory Result Means and Why It Causes Serious Harm

A false positive lab result is an inaccurate finding that indicates the presence of a disease, infection, or abnormal condition when none actually exists. Blood panels, biopsies, urine cultures, genetic screenings, and pathology reports are all capable of producing false positives when errors occur during collection, processing, or interpretation.

The harm from a false positive is not just emotional. Doctors who rely on a faulty result often prescribe aggressive treatment. A patient incorrectly told they have cancer may undergo chemotherapy, radiation, or surgery, each of which carries its own serious risks. A person told they have HIV, hepatitis, or another infectious disease may take powerful antiviral drugs with significant side effects. Someone given a false positive for a heart condition may be placed on blood thinners or beta-blockers that cause dangerous complications.

Beyond the physical damage, the psychological toll is enormous. Receiving a life-altering diagnosis, even one that turns out to be wrong, causes documented anxiety, depression, and post-traumatic stress. Patients near Millennium Park or living in Lincoln Park, Wicker Park, or Pilsen neighborhoods trust their local hospitals and labs to get it right. When those institutions fail, the consequences can follow a person for years.

False positives also delay correct diagnosis. While a doctor treats the wrong condition, the actual underlying problem, whether an infection, an autoimmune disorder, or something else entirely, goes unaddressed. That delay can turn a manageable condition into a serious one. Related errors, such as an incorrect pathology report or a specimen contamination issue, often contribute to the same chain of harm.

How False Positive Lab Errors Happen in Chicago Hospitals and Laboratories

False positive results stem from errors at multiple points in the testing process. Understanding where the breakdown occurred is essential to identifying who is legally responsible.

Specimen collection errors are among the most common causes. A sample drawn at a clinic near the University of Illinois Medical Center or sent to an independent lab can be contaminated at the collection site, mislabeled, or allowed to degrade before analysis. Cross-contamination between patient samples, a problem that occurs when proper protocols are not followed, can cause one patient’s positive result to appear on another patient’s report.

Instrument calibration failures also produce false positives. Analyzers and testing equipment require regular maintenance and quality control checks. When a hospital or commercial laboratory skips those checks, or when a technician uses equipment known to be malfunctioning, the results it generates cannot be trusted.

Interpretation errors happen when a qualified professional, such as a pathologist or clinical laboratory scientist, misreads the data. A borderline result that falls just above a reference threshold may be called positive without confirmatory testing, even though standard protocols require a second test before diagnosing serious conditions. The same type of error that leads to a cancer misdiagnosis or a false positive HIV diagnosis often involves a professional who failed to order or review confirmatory testing.

Communication failures add another layer of risk. Even when a lab flags a result as preliminary or recommends follow-up, that information can get lost between the lab, the treating physician, and the patient. A medical malpractice lawyer reviewing your case will look at every link in that chain to identify where the standard of care was breached.

Proving Medical Malpractice from a False Positive Lab Result Under Illinois Law

A false positive alone does not automatically create a malpractice claim. To succeed in Illinois, you must prove four things: a doctor-patient relationship existed, the healthcare provider deviated from the accepted standard of care, that deviation caused your injury, and you suffered measurable damages as a result.

The standard of care is the level of skill and diligence that a reasonably competent healthcare professional in the same field would exercise under the same circumstances. For a laboratory, that means following established protocols for specimen handling, quality control, and confirmatory testing. For a treating physician, it means not acting on a single unconfirmed positive result when the clinical picture does not support the diagnosis.

Illinois law requires you to attach an affidavit and a written report from a qualified health professional to your complaint when you file suit. This requirement comes from Section 2-622 of the Illinois Code of Civil Procedure (735 ILCS 5/2-622). The reviewing professional must be knowledgeable in the relevant area of medicine, must have practiced or taught in that area within the last six years, and must confirm in writing that there is a reasonable and meritorious basis for the claim. A separate certificate is required for each defendant named in the case. Failing to file a proper certificate can result in dismissal.

Causation is often the most demanding element to establish. You must show that the false positive result, not some other factor, was the direct cause of your harm. If a physician prescribed chemotherapy based on a false positive cancer diagnosis and you suffered organ damage as a result, your legal team must connect the lab error to the prescription and the prescription to the injury. Medical records, expert testimony, and lab documentation all play a role. A medical malpractice attorney who understands how to build that causation chain is essential to a successful case.

Under 735 ILCS 5/2-1115, punitive damages are not available in Illinois healing art malpractice cases. However, you can recover economic damages (medical bills, lost wages, future care costs) and non-economic damages (pain, suffering, emotional distress). Illinois does not cap non-economic damages in medical malpractice cases, following the Illinois Supreme Court’s ruling in Lebron v. Gottlieb Memorial Hospital.

Who Can Be Held Liable for a False Positive Lab Result in Chicago

Liability in a false positive case rarely falls on a single party. Multiple providers and institutions can share responsibility depending on where the error occurred.

The laboratory itself, whether it is an in-hospital lab at Northwestern Memorial, Rush University Medical Center, or an independent commercial facility, can be held liable when its technicians or equipment produce an inaccurate result due to negligent practices. Hospitals are often vicariously liable for the actions of their employed staff, including lab personnel.

The treating physician can also be liable. A doctor who orders a test, receives a positive result, and immediately begins aggressive treatment without ordering confirmatory testing may have breached the standard of care. Physicians are expected to evaluate whether a result is consistent with the patient’s symptoms and history before acting on it. When a doctor ignores clinical red flags suggesting the result may be wrong, that is a failure of professional judgment.

Pathologists and radiologists who interpret test results carry independent professional responsibility. If a pathologist misreads a biopsy as malignant when the tissue is benign, that professional can be named as a defendant. Errors related to an incorrect pathology report, specimen contamination, or biopsy processing failures can each form the basis of a separate claim against the professional who made the error.

Under 735 ILCS 5/2-1117, all defendants found liable are jointly and severally responsible for a plaintiff’s past and future medical and medically related expenses. Any defendant whose share of fault is 25% or greater is also jointly and severally liable for all other damages. This matters when multiple parties contributed to the harm. A medical malpractice lawyer can identify every responsible party and pursue each one appropriately.

Illinois Deadlines for Filing a False Positive Lab Result Malpractice Claim

Time limits on medical malpractice claims in Illinois are strict. Missing a deadline ends your right to compensation, regardless of how strong your case is.

Under 735 ILCS 5/13-212(a), you generally have two years from the date you knew, or through reasonable diligence should have known, that an injury occurred and that it may have been caused by medical negligence. This is called the discovery rule. It matters in false positive cases because patients often do not immediately realize that a diagnosis was wrong. The clock typically starts running when you learn the original result was inaccurate and that the treatment you received caused harm.

Illinois also imposes a four-year statute of repose. No matter when you discover the error, you cannot file a claim more than four years after the act or omission that caused the injury. This is an absolute cutoff in most adult cases. If a lab produced a false positive result and a physician treated you based on that result, the four-year clock starts from the date those events occurred.

For minors, 735 ILCS 5/13-212(b) provides a longer window. A claim involving a minor must be filed within eight years of the negligent act, but in no event after the minor’s 22nd birthday. If a healthcare provider intentionally concealed the error, 735 ILCS 5/13-215 allows you to file within five years of discovering that concealment.

Because the discovery rule analysis is highly fact-specific, do not assume you know when your clock started. Contact Briskman Briskman & Greenberg at (312) 222-0010 for a free consultation. Our firm is located at 205 W. Randolph St., Suite 925, Chicago, IL 60606, near the Daley Center and the Richard J. Daley Plaza, where many Cook County civil cases are filed. A medical malpractice attorney from our team can review your records and tell you exactly where you stand.

What Compensation You Can Seek After a False Positive Lab Error in Chicago

Victims of false positive laboratory errors can seek compensation for every measurable harm the error caused. Illinois law does not limit what you can recover for economic and non-economic losses in a medical malpractice case.

Economic damages cover the financial costs directly tied to the false positive. If you underwent unnecessary surgery, your surgical bills are recoverable. If you took toxic medications for weeks or months before the error was caught, the cost of treating the side effects from those medications is also recoverable. Lost wages from time away from work, both past and future, are included. If the harm from unnecessary treatment left you with a long-term disability, the cost of future medical care and lost earning capacity can be calculated and claimed.

Non-economic damages address the human cost of the error. The anxiety of believing you had a terminal illness, the grief of telling your family, the physical pain of unnecessary procedures, and the lasting emotional trauma are all compensable. These damages are not capped in Illinois, and they can be substantial in cases involving serious misdiagnoses.

In wrongful death cases, where a patient dies as a result of unnecessary treatment triggered by a false positive, the family can bring a claim under the Illinois Wrongful Death Act (740 ILCS 180). Recoverable damages include the loss of financial support, loss of companionship, and grief and sorrow suffered by surviving family members.

Attorney fees in Illinois medical malpractice cases are governed by 735 ILCS 5/2-1114, which caps contingent fees at 33 1/3% of all sums recovered. At Briskman Briskman & Greenberg, we handle medical malpractice cases on a contingency fee basis, meaning you pay no attorney fees unless we recover compensation for you. If you believe a false positive lab error caused you serious harm, a medical malpractice lawyer from our firm is ready to review your case. Call us at (312) 222-0010 to get started.

FAQs About False Positive Laboratory Results Medical Malpractice in Chicago

Does every false positive lab result give me a malpractice claim in Illinois?

No. A false positive becomes malpractice only when a healthcare provider deviated from the accepted standard of care and that deviation caused measurable harm. If the lab followed proper protocols and the result was a known statistical limitation of the test, and the physician acted reasonably in response, a malpractice claim may not succeed. The key questions are whether the error was preventable and whether the response to the result was reasonable given the clinical circumstances.

Can I sue both the laboratory and my treating doctor for a false positive result?

Yes. If the lab produced an inaccurate result due to negligent practices and your doctor then treated you aggressively without ordering confirmatory testing, both parties may share liability. Under 735 ILCS 5/2-1117, defendants whose fault reaches the 25% threshold are jointly and severally liable for all damages, not just medical expenses. An attorney can identify every party whose conduct contributed to your harm and pursue each one in the same lawsuit.

How long do I have to file a false positive malpractice claim in Chicago?

Under 735 ILCS 5/13-212(a), you generally have two years from the date you knew or reasonably should have known that a medical error caused your injury. An absolute four-year statute of repose also applies, meaning no claim can be filed more than four years after the negligent act, even if you discovered the error later. Because the discovery analysis is fact-specific, speak with an attorney as soon as you suspect an error occurred.

What does the Illinois Certificate of Merit requirement mean for my case?

Before your lawsuit can proceed, your attorney must attach an affidavit and a written report from a qualified health professional to the complaint, as required by 735 ILCS 5/2-622. That professional must practice or have practiced in the same area of medicine at issue within the last six years and must confirm in writing that there is a reasonable and meritorious basis for the claim. A separate certificate is needed for each defendant. Failing to file a proper certificate can result in dismissal of your case.

What damages can I recover if a false positive lab result led to unnecessary surgery or chemotherapy?

You can recover economic damages, including the cost of the unnecessary procedure, the treatment of any complications, lost wages, and future medical expenses. You can also recover non-economic damages for pain, suffering, emotional distress, and loss of normal life. Illinois does not cap non-economic damages in medical malpractice cases. If the unnecessary treatment caused a permanent injury or disability, future care costs and lost earning capacity are also recoverable. A wrongful death claim is available under the Illinois Wrongful Death Act (740 ILCS 180) if the patient did not survive.