Could a missed blood clot amount to medical negligence in NSW?

Many people who later suffered a serious blood clot had raised their concerns with a doctor days or weeks earlier. Their symptoms were dismissed, their risk factors were not assessed, and no preventive steps were taken. By the time someone acted, the clot had already caused lasting harm — or worse.

A common pattern — where care can break down

Venous thromboembolism — often called VTE — is a condition where a blood clot forms in a vein. The clot usually starts in a deep vein in the leg. Doctors call this a deep vein thrombosis, or DVT. If that clot breaks free and travels to the lungs, it becomes a pulmonary embolism, or PE. A pulmonary embolism can kill within hours.

VTE is one of the most preventable causes of hospital death in Australia. Clinical guidelines are clear. Risk assessment tools exist. Preventive treatments — such as blood-thinning medication and compression stockings — are widely available. Yet clinicians still miss VTE regularly. Understanding where care breaks down helps you recognise whether that happened to you.

Failure to assess risk before it happens

Every hospital patient in Australia should receive a VTE risk assessment on admission. This is not optional — it is a recognised standard of care. The assessment looks at factors like recent surgery, immobility, cancer, pregnancy, obesity, previous clots, and certain medications. When a clinician skips this step, a high-risk patient may receive no preventive treatment at all.

The Australian Commission on Safety and Quality in Health Care has published national standards that require hospitals to assess and manage VTE risk for admitted patients. Failure to follow these standards can form the basis of a negligence claim.

Failure to prescribe prophylaxis

Prophylaxis means preventive treatment — steps taken before a clot forms. For high-risk patients, this typically includes anticoagulant medication (blood thinners), compression stockings, or mechanical compression devices. When a clinician identifies a high-risk patient but fails to prescribe prophylaxis, that failure can directly cause a clot that would otherwise not have formed.

Failure to diagnose an existing clot

Sometimes a clot forms despite reasonable precautions. At that point, the clinician’s duty shifts to recognising the symptoms and ordering the right tests. A DVT typically causes leg pain, swelling, warmth, and redness. A pulmonary embolism causes sudden breathlessness, chest pain, a rapid heart rate, and sometimes coughing up blood.

When a patient presents with these symptoms and the clinician dismisses them without investigation, that dismissal can be negligent. The standard test for a suspected DVT is an ultrasound. For a suspected PE, a CT pulmonary angiogram is the gold standard. Ordering neither — and sending the patient home — is a pattern that appears repeatedly in VTE negligence cases.

Failure to treat promptly

Even when a clinician correctly diagnoses VTE, delayed treatment causes harm. Anticoagulant therapy must begin quickly. Every hour of delay allows the clot to grow or travel. A clinician who diagnoses a DVT but waits days to start treatment — or who discharges a patient before treatment is established — may have breached the standard of care.

When things start to go wrong

VTE does not always announce itself dramatically. Symptoms can be subtle, especially in the early stages. This is one reason clinicians miss it — and one reason patients do not always push back hard enough when they are dismissed.

Any one of these symptoms in a patient with known risk factors — recent surgery, long-haul travel, pregnancy, immobility, or a history of clots — should trigger immediate investigation. A clinician who notes these symptoms and does not act has likely fallen below the expected standard.

Understanding venous thromboembolism: what normally happens

Blood clots form as part of the body’s normal healing process. Under healthy conditions, the body dissolves clots once they have done their job. VTE occurs when a clot forms in a deep vein — usually in the legs — and does not dissolve naturally. The clot can grow, block blood flow, and cause serious damage to the surrounding tissue.

When a fragment of that clot breaks away and travels through the bloodstream to the lungs, it blocks blood flow to part of the lung. This is a pulmonary embolism. Large PEs can cause the heart to stop. Smaller ones can still cause permanent lung damage and long-term breathing problems.

For more general information about VTE and its symptoms, Healthdirect Australia provides reliable, plain-English health information.

Proper care for a patient at risk of VTE involves a structured process: assess the risk, prescribe appropriate prophylaxis, monitor for symptoms, investigate promptly if symptoms appear, and treat aggressively once a clot is confirmed. When any part of that process fails, the patient bears the consequences.

Why this matters legally

Duty of care is the legal obligation a clinician owes to their patient — a duty to provide treatment that meets the standard a competent professional in the same field would provide. Every doctor, nurse, and hospital that treats a patient in NSW carries this duty.

Not every bad outcome from VTE is negligence. Blood clots can form even when clinicians do everything right. Some patients have such severe underlying conditions that a clot is almost inevitable. The law does not require perfection — it requires reasonable care.

But when a clinician ignores clear risk factors, dismisses obvious symptoms, or fails to follow established clinical guidelines, the question of negligence becomes real. The gap between what the clinician did and what a competent clinician would have done is the foundation of a legal claim. For more on how this works, see Reframe Legal — Medical Negligence.

When venous thromboembolism may amount to medical negligence

The NSW Civil Liability Act 2002 sets the legal framework for negligence claims in this state. In plain terms, it means a court will ask whether a reasonable clinician in the same situation would have acted differently — and whether that different action would have prevented the harm.

Several specific scenarios commonly arise in VTE negligence cases in NSW.

If a hospital failed to complete a VTE risk assessment on admission — and you later developed a clot during that admission — the hospital may have breached its duty. National standards require this assessment for every admitted patient.

If a clinician identified you as high-risk but prescribed no prophylaxis — and you developed a DVT or PE — the failure to act on a known risk may constitute a breach. The clinician knew the danger and did nothing to prevent it.

If you presented to an emergency department with classic PE symptoms — breathlessness, chest pain, rapid heart rate — and the treating doctor sent you home without imaging, that decision may fall below the standard a competent emergency physician would have met.

If a GP dismissed your swollen, painful leg as a muscle strain without ordering an ultrasound, and you later suffered a PE, the failure to investigate a clear warning sign may be negligent.

If a surgeon discharged you after major surgery without anticoagulant medication or instructions about clot prevention, and you developed a VTE within days, the discharge plan itself may have been inadequate.

When harm becomes long-term or permanent

Many people assume that if they survived a blood clot, the harm is behind them. For a significant number of VTE survivors, that is not true. The consequences of a missed or delayed VTE diagnosis can persist for years — or for life.

Physical consequences

Post-thrombotic syndrome affects up to half of all DVT patients. This condition — caused by damage to the vein valves — produces chronic leg pain, swelling, skin changes, and in severe cases, leg ulcers. A pulmonary embolism can cause chronic thromboembolic pulmonary hypertension, a condition where the lungs sustain permanent damage and the heart works under constant strain. Some survivors require lifelong anticoagulation therapy.

Psychological consequences

Surviving a near-fatal PE is traumatic. Many survivors develop anxiety, particularly around breathlessness and physical exertion. Post-traumatic stress disorder is not uncommon. Families who lose a loved one to a preventable PE carry their own profound grief and psychological harm — and in some cases, that harm is legally compensable.

Financial consequences

Long-term VTE complications affect a person’s ability to work. Chronic leg pain limits mobility. Breathing difficulties reduce stamina. Ongoing medical treatment — specialist appointments, anticoagulant medication, compression garments, physiotherapy — creates sustained financial pressure. When negligence caused or worsened these outcomes, the law allows compensation to address them.

• 1
  Risk factor presentPatient undergoes surgery, is hospitalised, or has a known VTE risk factor. No risk assessment is completed.
• 2
  Clot formsWithout prophylaxis, a DVT develops in the leg. The patient notices swelling and pain but is told it is not serious.
• 3
  Symptoms dismissedThe patient returns to a clinician. No imaging is ordered. The patient is discharged with pain relief.
• 4
  Pulmonary embolismThe clot travels to the lungs. The patient collapses, is hospitalised in intensive care, or dies.
• 5
  Long-term harmSurvivors face chronic lung damage, post-thrombotic syndrome, psychological trauma, and financial loss — all stemming from a preventable failure.

What compensation can cover in venous thromboembolism cases

NSW law allows a person harmed by medical negligence to seek compensation for the losses that negligence caused. In VTE cases, those losses can be substantial — particularly where a PE caused permanent organ damage, disability, or death.

Compensation in NSW can cover pain and suffering, lost income (past and future), the cost of ongoing medical treatment, the cost of care and assistance at home, and out-of-pocket expenses. In cases involving death, family members may also have a claim for dependency losses.

Each case is assessed on its own facts. These figures are general ranges only. A VTE case involving permanent lung damage, loss of employment, and ongoing care needs will sit at a very different point on that scale than a case involving a DVT that resolved with treatment.

Time limits apply in NSW. Generally, a person has three years from the date they knew — or ought reasonably to have known — that they suffered harm from negligence. In cases involving death, different rules may apply. Acting within those limits matters.

Bringing it together — do the pieces fit?

You may not know whether what happened to you was negligence. That uncertainty is normal. Most people who have been through a serious VTE event are still processing what occurred — physically, emotionally, and practically. The legal question comes later, and it starts with facts, not certainty.

Ask yourself: Did a clinician know about your risk factors and still fail to act? Did you raise symptoms that were dismissed without investigation? Did a clot form during or after a hospital admission where no preventive steps were taken? Did a PE occur after a clinician sent you home without testing?

If the answer to any of those questions is yes, the circumstances may be worth examining carefully. Understanding how negligence claims work is a useful starting point — see Reframe Legal — How Medical Negligence Claims Work in NSW for a plain-English explanation of the process.

You don’t need certainty to understand your position

Many people who experienced a serious VTE event spend months — sometimes years — wondering whether something went wrong. Self-doubt is common. Clinicians are trusted figures. Hospitals feel authoritative. It is easy to assume that if something bad happened, it must have been unavoidable.

But legal clarity does not require you to be certain. It requires a careful examination of the facts — what the clinician knew, what they did, what they should have done, and what harm resulted. That examination is what a medical negligence lawyer does. Your job is simply to describe what happened.

If consent to a procedure was part of your experience — or if you were never told about the risks of VTE before surgery — that raises a separate but related legal issue. For more on that, see Reframe Legal — Informed Consent and Medical Negligence.

Clinicians in Australia are registered with AHPRA — Australian Health Practitioner Regulation Agency, which sets and enforces professional standards. Understanding that framework can help you make sense of the system you are navigating.

About the lawyer behind this article

Dr Rosemary Listing is a NSW lawyer with a PhD focused on medical negligence. Her academic and legal work examines how clinical systems fail patients — and what the law can do about it.

Dr Listing has worked on cases involving missed and delayed VTE diagnoses, including situations where patients presented with clear symptoms and received no investigation, and where hospitals discharged surgical patients without any clot prevention plan. She understands both the clinical pathway that should have been followed and the legal framework that applies when it was not.

In VTE cases, harm rarely comes from the clot alone. It comes from the delay — the days between a dismissed symptom and a correct diagnosis, or the gap between a high-risk admission and a preventive prescription that was never written. That delay is where the legal question lives.

People who seek legal clarity after a VTE event are not looking to blame anyone for a bad outcome. They want to understand whether the care they received met the standard they were owed. That is a reasonable question, and it deserves a careful answer.

Dr Listing’s role is to examine the facts of what happened, compare them against the clinical standard that applied, and give an honest assessment of whether a legal claim has merit. She works with clients across NSW.

This article is general legal information only. It does not constitute legal advice. Each person’s circumstances are different. The law discussed applies to New South Wales, Australia. Time limits apply to legal claims.