Understanding the Importance of Counterfactual Reports in Emergency Medicine Expert Witness Cases
- Forteath Consulting
- Jul 17
- 4 min read
When a patient is not directed to the emergency department from primary care or NHS 111, questions often arise about whether this decision breached the duty of care owed to the patient. In legal cases involving such primary care breaches, the role of an Emergency Medicine Expert Witness becomes crucial. One of the most important tools these experts use is the counterfactual report. This report explores what would have happened if the patient had been referred to the hospital. It helps establish whether, on the balance of probabilities, the correct diagnosis and treatment would have been started in time to change the patient’s outcome.
This post explains why counterfactual reports are essential in these cases, how they are prepared, and what legal professionals should expect from an Emergency Medicine Expert Witness.
Emergency department triage desk where patients are assessed for urgent care
What Is a Counterfactual Report in Emergency Medicine?
A counterfactual report is a detailed expert opinion that answers a hypothetical question: What would have happened if the patient had been sent to the emergency department at the time of initial contact? This question arises when there is an allegation that primary care or NHS 111 failed to refer a patient in a timely manner, leading to harm.
The report examines:
The patient’s symptoms and clinical presentation at the time of initial primary care contact.
The standard of care expected in primary care or NHS 111 from a primary care expert
The likely diagnosis and treatment if the patient had been seen in the emergency department by an emergency medicine expert
Whether timely hospital referral would have changed the outcome
The expert witness uses clinical guidelines, medical literature, and their own experience in emergency medicine to provide a clear, evidence-based opinion.
Why Is the Counterfactual Report Critical in Legal Cases?
In negligence claims involving healthcare, proving breach of duty is only part of the case. The claimant must also show causation—that the breach caused harm. The counterfactual report addresses this by establishing what would have happened if the breach had not occurred.
For example, if a patient with chest pain was not sent to hospital and later suffered a heart attack, the report will assess:
Would the emergency department have diagnosed the heart condition earlier?
Would treatment have started sooner?
Would earlier treatment have prevented or reduced harm?
This analysis helps the court decide if the breach in primary care or NHS 111 referral caused the injury or death.
How Emergency Medicine Experts Prepare Counterfactual Reports
Preparing a counterfactual report requires a thorough review of all available evidence:
Medical records from primary care, NHS 111, and hospital (if applicable).
Clinical guidelines relevant to the patient’s symptoms and condition.
Witness statements and any other relevant documentation.
Timeline of events to understand the progression of illness.
The expert then reconstructs the clinical scenario as it would have unfolded in the emergency department. This includes:
Likely investigations (blood tests, imaging, ECG).
Probable diagnosis based on symptoms and test results.
Standard treatment protocols.
Expected patient response to treatment.
The emergency medicine expert must clearly explain their reasoning and the evidence supporting their conclusions. The report should be accessible to legal professionals without medical backgrounds.
Examples of Cases Where Counterfactual Reports Make a Difference
Case 1: Missed Sepsis Diagnosis
A patient is assessed by telephone remotely by an out of hours G.P with fever and severe non-traumatic limb pain and is advised to take regular analgesia for a flu-like illness. The patient is admitted to hospital the next day with severe sepsis from necrotising fasciitis and suffers long-term morbidity and post-ICU syndrome. The counterfactual report examines whether early hospital referral would have led to earlier antibiotic treatment and a less severe outcome.
Case 2: Delayed Stroke Recognition
A patient contacts their GP with sudden onset balance difficulties but is not referred urgently to A&E. The report assesses if emergency department assessment and imaging would have led to thrombolysis for a stroke, improving recovery chances.
Case 3: Undiagnosed Appendicitis
A patient's mother contacts NHS 111 for their 8 year old child who is experiencing abdominal pain and vomiting but is told to monitor symptoms. The report evaluates if emergency assessment would have led to earlier surgery and avoided complications like perforation.
These examples show how the counterfactual report clarifies the clinical impact of referral decisions.
What Legal Professionals Should Expect from Emergency Medicine Expert Witnesses
When instructing an Emergency Medicine Expert Witness, legal teams should expect:
A clear explanation of the clinical issues in plain language.
A balanced opinion based on evidence, not speculation.
Identification of the standard of care.
A detailed counterfactual analysis addressing causation.
Support for the expert’s conclusions with references to guidelines and literature.
Willingness to explain and defend the report in court if needed.
Choosing an expert with extensive emergency medicine experience ensures the report is credible and persuasive. Dr Tunnard is regularly instructed across the UK to provide counterfactual reports.
The Impact of Counterfactual Reports on Case Outcomes
Counterfactual reports often play a decisive role in settlement negotiations or court judgments. They help:
Clarify complex medical issues for judges and juries.
Establish whether the breach caused harm on the balance of probabilities.
Support fair compensation for patients harmed by delayed or missed referrals.
Encourage improvements in primary care and NHS 111 referral pathways.
Without a counterfactual report, it is difficult to prove causation in cases involving failure to send patients to hospital.
The counterfactual report is an important skillset for Emergency Medicine Expert Witnesses when patients were not referred to hospital from primary care or NHS 111. It provides a clear, evidence-based opinion on what would likely have happened if the patient had been sent to the emergency department. This helps legal professionals understand the clinical impact of referral decisions and supports fair outcomes in negligence claims.
If you are involved in a case where a breach of duty in primary care is suspected and has been confirmed by a primary care expert, instructing Dr Tunnard as an Emergency Medicine Expert Witness to prepare a counterfactual report is the next essential step. This report will clarify the clinical picture, establish causation, and guide the legal process toward a just resolution.
