Medical treatment does not always go as planned, and complications can arise that result in harm to a patient. In many cases, such outcomes occur despite appropriate and reasonable care having been provided. However, there are also situations where that harm is attributable to mistakes or omissions on the part of healthcare professionals. It is in these circumstances that a claim for medical negligence may arise.
Medical negligence claims are among the most complex types of legal cases. The two fundamental questions in each case are:
- Whether the healthcare professional acted in accordance with the standard expected of a reasonably competent practitioner, and
- Whether the patient suffered harm which could have been avoided.
The answers to these questions can usually only be provided by independent medical expert witnesses.
What Is meant by “Independent Medical Expert Witness”?
An independent medical expert is a qualified healthcare professional who provides an objective opinion to the court in a medical negligence claim. They are not involved in the patient’s care and have no interest in the outcome of the case.
Although instructed by one of the parties, an independent medical expert owes an overriding duty to the court. Their evidence must be unbiased and impartial, even if does not support the party who instructed them.
Who can be Medical Expert Witness?
A medical expert witness is typically a suitably qualified and experienced healthcare professional with expertise in the relevant area of medicine.
In most cases, this will be a practising or recently practising clinician—such as a consultant, GP, nurse, or other specialist—whose experience corresponds with the issues in dispute.
The key requirement is that they have sufficient knowledge and expertise to give an informed opinion on the standard of care in that particular field of medicine.
To act as an expert witness, the individual must be able to show that they have:
- Appropriate qualifications and professional experience
- Up-to-date knowledge of current medical practice
- An understanding of their duty to the court
- An ability to provide clear, reasoned, and impartial opinions
Ultimately, the expert must be competent to assist the court on the specific medical issues in question, rather than simply hold a general medical qualification.
What is the role of the Independent Medical Expert?
- Breach of Duty (Standard of Care)
A key issue in every medical negligence claim is whether the care provided by a clinician is in keeping with the standard expected of a reasonably competent professional in their field.
This is not a question that lawyers or the court can determine without assistance from an expert witness, as it involves matters of clinical judgment and specialist knowledge.
An independent expert witness will consider the facts of the case and evaluate the treatment provided by reference to accepted medical practice at the material time.
Their opinion will assist the court to determine:
- What a reasonably competent practitioner would have done in comparable circumstances
- Whether the conduct of the relevant healthcare professional met the standard of a reasonably competent practitioner
- If there was a departure, whether it was capable of justification
- Causation (the link between substandard care and harm suffered)
Medical expert evidence is also critical in determining causation—namely whether any breach of duty actually caused harm.
The expert will assist the court by considering:
- Whether the injury would have occurred in any event
- Whether earlier or different treatment would have altered the outcome
- The extent to which any failing contributed to the harm
- Condition and Prognosis
In addition to addressing breach of duty and causation, a medical expert plays an important role in assessing a claimant’s condition and prognosis.
A condition and prognosis report focuses on the nature and extent of the injury, as well as the likely future impact on the claimant. The expert will review the medical records, examine the claimant where appropriate, and provide an opinion on their current condition.
In particular, the expert will address:
- The nature and severity of the injury
- The symptoms experienced and their effect on daily life
- The likely course of recovery
- Whether any symptoms or disabilities are likely to be permanent
- The need for further treatment, care, or rehabilitation
The expert’s opinion on prognosis is especially important, as it helps the court to assess how the injury will affect the claimant in the future. This can include considerations such as ongoing pain, loss of function, or the need for long-term support.
Such reports are therefore central to valuing a claim, as they provide the medical foundation for assessing damages, including compensation for pain and suffering, as well as future losses and care needs.
How Is Expert Evidence Presented?
Expert evidence is typically presented in the form of a formal written report. This report must comply with strict procedural rules and outline the expert’s qualifications and experience, identify the materials they have considered, and set out their opinions with supporting reasoning.
In some cases, experts may also be required to:
- Respond to questions from the opposing party
- Participate in joint discussions with opposing experts
- Produce joint statements identifying areas of agreement and disagreement
- Attend court to give oral evidence
The ability to explain complex medical concepts in an accessible and impartial manner is as important as clinical expertise.
Duties of the Medical expert
The duties of an expert witness are governed by Part 35 of the Civil Procedure Rules (CPR). CPR 35 sets out that an expert’s overriding duty is to the court, rather than to the party who instructs them. It requires the expert to provide independent, objective, and unbiased opinion evidence within their area of expertise.
The rules also impose clear obligations in relation to the content and format of expert reports, ensuring that opinions are properly reasoned, transparent, and based on the material facts. Compliance with CPR 35 is essential, as it underpins the reliability and integrity of expert evidence in litigation.
Civil Procedure Rules (CPR) Part 35
Strategic Importance of Expert Evidence in Claims
Expert evidence shapes the trajectory of a medical negligence claim. Early expert input can help to:
- Assess the merits of a potential claim
- Support pre-action negotiations
- Encourage settlement where appropriate
- Refine the issues for trial
Strong, well-reasoned expert evidence is required to achieve a favourable outcome.
Conclusion
Expert medical evidence is fundamental to the fair and effective resolution of medical negligence claims. It provides the court with the specialist insight needed to assess whether care met the required standard, whether any failing caused harm, and the extent of the impact on the patient’s life. From the early stages of a claim through to trial, the quality, independence, and clarity of expert evidence will often determine the strength of the case and, ultimately, its outcome.
Krishna Kotecha, Partner and Specialist Medical Negligence Solicitor from MDS, said “Medical negligence cases are only as strong as the expert evidence behind them. Get the right expert, and you build a compelling case; get it wrong, and even the strongest claim can fail.”
