When a patient believes that treatment fell below an acceptable standard, the dispute turns on questions that only a clinician can answer. Was the care reasonable? Did any failing cause harm? What would have happened with better care? An independent medical expert addresses those questions, and the claim often rises or falls on the answers.
A clinical negligence claim in England and Wales rests on two central points. The claimant must show that the care given fell below the standard a reasonably competent practitioner in that field would provide, which is called breach of duty. The claimant must also show that the breach caused injury or made it worse, which is called causation. Both points usually need specialist input, and Marco Scarci, thoracic surgery expert witness, and consultant thoracic surgeon, provides reports on medical negligence, missed or delayed diagnosis, and lung cancer.
Neither point can be settled from the medical records alone. Records show what was done and when, and an expert explains what a competent clinician would have done and what difference it would have made.
Where a claim concerns a missed lung cancer or a delayed response to a chest complication, a surgeon who operates on those conditions can speak to the standard of care from direct experience.
Most claims follow a structured process before any court is involved. The Pre-Action Protocol for the Resolution of Clinical Disputes is, according to its own text, now regarded by the courts as setting the standard of normal reasonable pre-action conduct for the resolution of clinical disputes. It provides for a defendant to be given four months to investigate and respond to a Letter of Claim before proceedings are served.
That timetable shapes the use of experts. A claimant's solicitor will usually obtain an initial opinion before sending the Letter of Claim, so that allegations are grounded in evidence. The defendant, in turn, may seek its own advice during the four months. If liability is denied, the response should explain why, and further expert reports often follow.
In practice, many responses take longer than the protocol suggests, particularly in complex cases. Claimants should expect the expert phase to be spread across months.
Early advice also shapes strategy. If the first expert opinion supports breach but not causation, a solicitor may advise that the claim is unlikely to succeed, however poor the care. If it supports both, the Letter of Claim can set out the allegations with confidence, and the discussion with the defendant starts from a firmer base. For claimants, this early filter is one of the main protections against pursuing a claim that cannot win.
A single claim can involve several experts. A surgeon may comment on whether an operation was performed to a proper standard, a radiologist on whether a scan should have shown an abnormality, and an oncologist on how a delay changed the outlook. Each speaks to a different link in the chain.
Matching specialty to question avoids wasted cost. Breach is judged against the standard of the relevant field, so the expert needs current experience in treating the condition. Causation often turns on how a disease behaves over time, which may call for a different specialist from the one who judges the original treatment.
Solicitors should ask any candidate whether the questions fall within their expertise. An expert who says so early, and recommends a colleague, is protecting the claim. Some claims involve joint instruction of a single expert on particular issues, which the court may encourage where the matter is not contentious.
Experts owe a duty to the court that overrides any duty to the party who pays them. The Civil Justice Council's guidance for the instruction of experts offers a useful test, which is that an expert should express the same opinion if given the same instructions by another party. It adds that experts should not act as advocates for the side that instructs them.
For claimants, independence can feel unwelcome when an expert's view is less favourable than hoped. In fact, it is protective. A report that candidly states weaknesses allows the solicitor to advise realistically, to settle sensibly or to decline a claim that would fail, saving cost and distress.
An independent report also carries weight with the other side. Defendants and their insurers give more attention to reasoning they cannot dismiss as partisan. It also makes cross-examination less damaging, because the expert has already conceded fair points. Fairness pays.
Claimants should expect to provide consent for records, to answer questions about the history and, for some experts, to attend an examination. The expert reviews notes, imaging and statements, explains in writing what happened clinically and gives an opinion on breach, causation and outlook.
The practice behind the thoracic surgery expert witness service states that it offers fast turnaround, fixed fees for reports and flexible payments in compensation cases, and that each report is quality checked. Claimants should confirm costs and timing with their solicitor, since the solicitor instructs the expert.
Once a report is served, either side may put written questions to the expert, and the expert's answers become part of the evidence. A claimant who does not understand part of a report should ask the solicitor to raise it. Remember that the expert writes for the court and not for the claimant, so the tone may feel clinical even when the findings are sympathetic.