Misdiagnosis
Claims lawyer.
Zayouna Law Firm reviews misdiagnosis and delayed diagnosis claims in Ontario, from missed cancers to untreated infections.
Being wrong is not the same as being negligent.
Diagnosis is probabilistic work done with incomplete information, and the law accepts that. A physician who reasonably considered your symptoms, ordered appropriate tests and reached a defensible conclusion has generally met the standard even if the conclusion turned out to be wrong. What falls below the standard is failing to consider an obvious possibility, not ordering the test that would have settled it, or not following up on a result that did.
Then comes the harder question, and it defeats more claims than the first one. Even where the diagnosis was clearly missed, you have to show that catching it when you should have caught it would have changed your outcome. With a cancer already advanced at first presentation, sometimes it would not have.
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What the claim actually turns on
Two findings, from two different experts. One in the relevant specialty, on whether the diagnostic process fell below the standard. One on causation, addressing what your prognosis would have been with earlier treatment compared with what it is now. That gap between the two prognoses is, in practical terms, the claim.
This is why timing dominates these files. A breast cancer found at stage one and treated has a very different trajectory from the same cancer found at stage three eighteen months later, and that difference is measurable. A condition that was already advanced when you first presented may produce no measurable difference at all, which means no recoverable loss even where the error is obvious. Being told this early saves years.
WHAT A MISDIAGNOSIS CLAIM CAN COVER
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Diagnoses that are commonly missed
Some conditions are missed far more often than others, usually because their early presentation looks like something ordinary. These are the ones that recur in Ontario claims. Appearing on this list does not make a case, and a condition not on it is not excluded.
- Cancer, where a scan, biopsy or referral was not ordered or not followed up
- Heart attack presenting atypically, particularly in women and younger patients
- Stroke mistaken for migraine or vertigo, often in an emergency department, where the window is hours
- Sepsis treated as a minor infection
- Meningitis, appendicitis and ectopic pregnancy presenting early
What proves a missed diagnosis?
The paper trail is usually decisive and it is more complete than people expect. Your chart records the symptoms you reported, what was examined, what was ordered, what came back, and whether anyone acted on it. A result that arrived and was never communicated is the pattern that appears again and again.
How long do you have to sue?
Generally two years from when you knew, or reasonably should have known, that you were harmed by the care. With a missed diagnosis that clock often starts at the later diagnosis rather than the original appointment, since that is usually the first point you could have known. Do not rely on that assumption without advice.
Is a CPSO complaint the same thing?
No, and the difference matters. The College of Physicians and Surgeons of Ontario regulates physicians and can investigate and discipline, but it does not award you compensation. If accountability is what you want, that route is free and does not need a lawyer. If you need the cost of your care and your losses covered, that is a civil claim.
Our Misdiagnosis Claim Experience
Anthony Windwar leads the firm’s medical malpractice files, obtaining the records and having them reviewed on standard and causation. Part of the firm’s medical malpractice practice. Book a free consultation.
Results
The first honest answer is often that the delay changed nothing measurable. Getting that answer in months instead of years is worth something in itself.
Relationships
These conversations happen while you are still in treatment. You deal with the lawyer handling your file, and the firm works in several languages with interpreters available.
Recovery
Recovery here is the difference between the outcome you have and the one you should have had, valued as treatment costs, care needs and lost earning capacity.
Service Areas
Misdiagnosis Toronto
Misdiagnosis claims for Toronto patients, including missed cancers and delayed referrals from family practices.
Misdiagnosis Burlington
Misdiagnosis claims for Burlington and Halton patients, from the firm’s Ironstone Drive office.
Misdiagnosis Ontario
Claims taken from patients across Ontario, including delayed diagnoses first identified after a move to another practice.
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Common Questions About Misdiagnosis Law.
Can you sue a doctor for misdiagnosis in Canada?
You can, but not for the error alone. You have to show the diagnostic process fell below the standard of a reasonably competent physician, and that a correct and timely diagnosis would have produced a better outcome. Where the condition was already advanced at first presentation, the second part often can’t be established.
Can you sue a hospital for misdiagnosis?
Sometimes. Hospitals answer for their own staff, including nursing staff, while physicians are usually independent, so who is named depends on who was involved.
How long do I have to bring a misdiagnosis claim?
Generally two years from when you knew or should have known you were harmed, which is often the later, correct diagnosis.
How hard is it to prove a misdiagnosis claim?
Harder than most claims. It needs two expert opinions, one on the standard of care and one on whether earlier treatment would have helped. The medical malpractice FAQ covers the process.
How do I report a doctor in Ontario?
Through the College of Physicians and Surgeons of Ontario. It can discipline a physician but can’t award you compensation.
What does a misdiagnosis claim cost to start?
The first review costs nothing. Ask how expert costs are handled before retaining anyone, since they’re the main expense.
How long does a misdiagnosis case take?
Usually years. Records, expert review and the course of your own treatment all set the pace.
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If you have been injured due to someone else’s negligence, our personal injury lawyers help individuals and families across Ontario understand their legal options and pursue the compensation they deserve.