Medical Negligence Or A Poor Outcome In WA: How To Tell The Difference

A bad result is not the same as medical negligence. In WA you can have surgery that fails, a diagnosis that lands too late, or a treatment that leaves you worse, and still have no claim. The law doesn’t ask whether the outcome was bad. It asks two colder questions: did the care fall below what the doctor’s own peers accept as competent, and did that failure actually cause your injury? Answer no to either, and there’s no medical negligence claim, however upsetting the result.

That space between a poor outcome and a legal wrong is where most people get stuck. So let’s draw the line under the WA law that actually applies, not the general story you’ll read on interstate sites.

Medical negligence in WA is health care that falls below the standard widely accepted by the practitioner’s peers as competent, where that failure causes harm the patient would otherwise have avoided. It sits under the Civil Liability Act 2002 (WA). A poor outcome on its own, without a breach that caused the harm, is not negligence.

What’s the difference between medical negligence and a poor outcome?

The difference is fault plus cause, not the result. A poor outcome is any bad result, even after careful, competent treatment. Medical negligence is a bad result that a competent practitioner would have avoided, where the substandard care caused the harm.

Medicine carries risk. Some operations fail at known rates. Some bleeds and cancers hide from a good scan. A known complication that happens despite proper care is a poor outcome, not negligence. It crosses into negligence only when the care itself drops below the accepted standard and that drop causes the injury.

	Poor outcome (no claim)	Medical negligence (claim may run)
The care	Met the accepted standard	Fell below the accepted standard
Cause of harm	The condition, or a known risk with no fault	The substandard care itself
Worked example	A brain bleed worsens during a fast, correct transfer to surgery	A brain bleed missed on a scan that was misread, delaying treatment
Legal result	No breach, so no claim	Breach plus causation, a claim may run

The four elements of a WA medical negligence claim

To win, you prove four things: a duty of care, a breach of that duty, that the breach caused your harm, and a loss the law recognises. Miss one and the claim fails.

Duty is rarely the fight, because a treating practitioner owes you one. The real contests are breach, meaning the care was below standard, and causation, meaning that failure caused this harm. We set out each of the four elements in a separate WA guide, because those two are where claims are won and lost.

How WA decides whether your doctor was negligent

WA uses a peer standard. Under section 5PB of the Civil Liability Act 2002 (WA), a practitioner is not negligent if they acted in a way widely accepted by their peers as competent practice, even where other practitioners would have done it differently.

That’s a real hurdle for a claimant. Two doctors can disagree, and if a respected body of opinion backs what yours did, that can defeat a breach claim even after a bad result. The practice doesn’t have to be universally accepted, only widely accepted. There’s one exception: a court can still find negligence if the accepted practice was so unreasonable that no reasonable practitioner would follow it. And you carry the onus of proving the breach. This is why WA cases turn on independent expert evidence from another specialist in the same field.

Here’s the part people find hardest to accept. “My doctor clearly made a mistake” is not the legal test. The test is whether their peers would call it below competent practice. A mistake a fair slice of the profession would also have made may not be a breach at all.

Causation: where most obvious mistakes fall apart

Even a proven mistake wins nothing unless it caused your injury. Section 5C of the Civil Liability Act 2002 (WA) requires the negligence to be a necessary condition of the harm. Put plainly: would you have avoided the injury but for the mistake?

This is the element most pages stay quiet about, and it’s the one the misread-scan story really turns on. Take the classic version. A CT scan is read as clear when there was a bleed, and a second scan later finds it. The misreading is a breach. The claim still hangs on causation. Would earlier treatment have changed the outcome, or was the damage already done? If the same harm would have followed regardless, you have a breach with no compensable loss. Naming that question is what decides the case, and it’s exactly the question a bad-outcome story skips.

WA even limits your own say-so here. If the issue is what you would have done had you been warned, the Act restricts your after-the-fact statement that you’d have refused treatment (section 5C). The court weighs it objectively rather than taking the claim at face value.

Consent and the duty to warn

A signed consent form doesn’t end a claim. Warning about risk is judged by a different rule from treatment, and the peer defence in section 5PB does not cover the duty to give information about risk.

Your doctor must warn you of material risks before you agree to treatment. That standard comes from the High Court in Rogers v Whitaker (1992). A risk is material if a reasonable person in your position would likely attach significance to it, or if your doctor should have known that you would. Consent on paper doesn’t fix a failure to warn. If you were never told about a serious risk that then happened, and you’d have chosen differently, that can be negligence even where the surgery itself was done well.

How much compensation can you claim in WA?

You can claim for pain and suffering, past and future loss of earnings, medical and care costs, and out-of-pocket expenses. But WA cuts the small end of pain-and-suffering damages, and that catches people out.

Under sections 9 and 10 of the Civil Liability Act 2002 (WA), damages for non-pecuniary loss are reduced by a threshold. When the Act began, an assessed loss at or below a base figure of $12,000 recovered nothing, and amounts up to a higher figure of $36,500 were scaled down. Those figures are indexed every year and published in the Gazette by 1 July, so today’s thresholds sit higher. The practical result: a minor injury with a clear mistake behind it can still recover little or nothing for pain and suffering, though economic losses like lost wages and treatment costs are assessed separately. Serious harm, such as a spinal injury, is a different picture.

How long do you have to make a claim in WA?

Generally 3 years. Section 14 of the Limitation Act 2005 (WA) bars a personal injury action once 3 years have passed since the cause of action accrued.

WA is stricter than many people assume. Unlike some states, it has no broad “date you found out” extension written into the Act. If you’re out of time, your main route is asking a court to extend under section 39, granted only in limited cases. Children and people with a mental disability get more time under sections 30 to 36. The tight clock and the limited relief are why a late-surfacing problem, like a missed diagnosis you only connect to your injury years later, needs advice early rather than eventually.

What to do next if you suspect medical negligence (2026)

Start by protecting the evidence and fixing the timeline, then get advice before the 3 years runs.

Request your full medical records. Write down dates, names, and what you were told while it’s fresh. If you want the care reviewed outside a claim, WA’s Health and Disability Services Complaints Office handles complaints about health services, though a complaint is not a compensation claim and doesn’t pause the limitation clock. Then have a lawyer assess whether the care breached the standard and whether the breach caused your loss, because those two questions, not the bad result, decide the case.

At Soul Legal you deal directly with a lawyer, not a case manager. I’ve acted for injured people across WA since 1997, and my colleague Kevin Wong since 1991. We run these matters on a No Win No Fee basis, the first consultation is free, and we visit clients at home or in hospital when getting to us is hard. The line between a poor outcome and medical negligence is decided fact by fact, and in WA it usually comes down to causation, so if a bad result might be more than bad luck, get it looked at while the evidence and the deadline are still on your side.

Frequently asked questions

Is a misdiagnosis medical negligence in WA?

A misdiagnosis is only medical negligence if the care fell below the standard your doctor’s peers accept as competent and it caused you harm you would otherwise have avoided. Many missed or delayed diagnoses are breaches, but the claim still turns on causation under section 5C of the Civil Liability Act 2002 (WA). A wrong call that changed nothing about your outcome may not be compensable.

Can I still claim if I signed a consent form?

Possibly, yes. A consent form doesn’t cover a failure to warn. Under Rogers v Whitaker, your doctor must tell you about material risks, and section 5PB says the peer-practice defence doesn’t apply to giving that risk information. If you weren’t warned of a serious risk that then happened, and you’d have chosen differently, that can be negligence.

How long do I have to make a medical negligence claim in WA?

Usually 3 years from when the cause of action accrued, under section 14 of the Limitation Act 2005 (WA). WA has no broad date-of-knowledge extension, so if you’re out of time your main route is asking a court to extend under section 39, granted only in limited cases. Children get more time, and it’s worth getting advice early.

Who do I claim against, the doctor or the hospital?

It depends on who was at fault and who employed them. A public hospital can be liable for its staff, while a private specialist is often liable personally through their own insurer. Sometimes more than one party is involved, so a lawyer identifies the right defendant early, which also matters for the time limit.

Is a medical negligence claim the same as a complaint to HADSCO?

No. WA’s Health and Disability Services Complaints Office reviews and resolves complaints about health services, but it doesn’t award compensation. A complaint can run alongside a claim, but it isn’t a claim and it doesn’t pause the 3-year limit.

How much does a medical negligence claim cost in WA?

Soul Legal runs medical negligence matters on a No Win No Fee basis, so there are no legal fees unless the claim succeeds. On a successful claim, a share of costs is usually recovered from the other side. The first consultation is free.