The Bolam test is a fundamental principle in UK clinical negligence law. It is primarily used to determine whether a healthcare professional met the required standard of care when diagnosing or treating a patient. The principle originates from Bolam v Friern Hospital Management Committee [1957] 1 WLR 582, a landmark case involving electroconvulsive therapy (ECT).

The test has developed significantly since 1957. In particular, Bolitho v City and Hackney Health Authority [1998] AC 232 established that professional opinion relied upon must have a logical basis, while Montgomery v Lanarkshire Health Board [2015] UKSC 11 established a different, patient-centred approach to informed consent and material risks.

What Is the Bolam Test?

The Bolam test asks whether a healthcare professional acted in accordance with a practice accepted as proper by a responsible body of appropriately skilled professional opinion.

In practical terms, a doctor or other healthcare professional will not necessarily be negligent simply because another competent professional would have chosen a different course of action. Medicine can involve legitimate differences of clinical judgment, particularly where more than one recognised treatment approach exists.

The relevant question is whether the treatment, diagnosis or clinical decision fell below the legally required standard of care when assessed against responsible professional practice.

The principle is particularly relevant to allegations concerning:

• Diagnosis and missed or delayed diagnosis
• Clinical treatment decisions
• Surgical procedures
• Medication and prescribing
• Monitoring and follow-up
• Referral decisions
• Management of complications
• Other areas involving professional clinical judgment

The Bolam principle therefore does not simply ask whether harm occurred. A patient generally needs to establish that the healthcare professional breached the applicable duty of care and that the breach caused the relevant injury or loss.

The Bolam Case Explained

The Bolam test takes its name from Bolam v Friern Hospital Management Committee [1957] 1 WLR 582.

Mr John Hector Bolam was receiving treatment for depression at Friern Hospital. He underwent electroconvulsive therapy without a muscle relaxant and without physical restraint. He subsequently suffered fractures during the procedure.

His claim raised questions about whether the hospital had been negligent in the way the treatment was administered.

Expert evidence was important to the court's assessment of the appropriate medical standard. The case established the principle that a professional may avoid a finding of negligence where the conduct was consistent with a practice accepted as proper by a responsible body of professionals skilled in the relevant field.

The case therefore became the foundation for the traditional approach to assessing breach of duty in clinical negligence claims.

How the Bolam Test Works in Medical Negligence Claims

A clinical negligence claim normally requires more than proof that a patient experienced an undesirable outcome.

The legal assessment can involve several distinct questions:

1. Was there a duty of care?
2. What standard of care was required?
3. Did the healthcare professional breach that standard?
4. Did the breach cause the injury or deterioration complained of?
5. What loss resulted from the injury?

The Bolam principle is principally concerned with the standard of professional care and breach of duty, rather than being a complete test for every element of negligence.

For example, a patient may suffer complications following surgery even though the surgeon complied with an accepted and reasonable surgical practice. The existence of a complication does not, by itself, establish negligence.

Conversely, expert evidence may indicate that the treatment decision was not supported by a responsible body of professional opinion. The court can then consider whether the required standard of care was breached.

The Importance of Medical Expert Evidence

Medical expert evidence is often central to the application of the Bolam principle.

Courts generally require assistance from appropriately qualified experts when determining whether clinical conduct met the required professional standard. An expert may review medical records, witness evidence, clinical guidelines and other relevant information before providing an opinion.

The expert may be asked to address issues such as:

• Whether the diagnosis was reasonable in the circumstances
• Whether appropriate investigations should have been undertaken
• Whether treatment was clinically appropriate
• Whether a referral should have been made
• Whether monitoring was adequate
• Whether an alternative treatment should reasonably have been considered
• Whether the healthcare professional's decision was supported by responsible professional practice
• Whether any breach caused the patient's injury

The expert's role is not simply to identify what they personally would have done. The relevant question is whether the defendant's conduct was within a professionally acceptable range.

For solicitors handling clinical negligence matters, selecting an expert with appropriate qualifications, experience and expertise in the relevant clinical specialty is therefore particularly important.

Bolam Test and the Bolitho Principle

The traditional Bolam test was subsequently qualified by Bolitho v City and Hackney Health Authority [1998] AC 232.

Bolitho confirmed that a court does not have to accept professional evidence merely because a responsible body of practitioners supports the relevant practice. The professional opinion must also be capable of withstanding logical analysis.

This means that the assessment is not simply a matter of counting experts on each side.

A court can examine whether the reasoning supporting the professional opinion is logically defensible, including consideration of the risks and benefits associated with competing approaches.

The Bolitho qualification is particularly important because it demonstrates that medical opinion does not automatically determine the legal outcome.

Bolam Test and Informed Consent: The Montgomery Decision

One of the most significant developments in this area is Montgomery v Lanarkshire Health Board [2015] UKSC 11.

Montgomery concerned the information that should be provided to a patient about treatment risks and reasonable alternatives. The Supreme Court held that the doctor's duty to take reasonable care to ensure that a patient is aware of material risks involved in proposed treatment and reasonable alternatives is not governed by the traditional Bolam approach.

This distinction is important.

The clinical question of how treatment should be performed may engage the Bolam/Bolitho principles. However, the question of what material risks and reasonable alternatives should be discussed with the patient is assessed under the patient-centred approach established in Montgomery.

Consequently, it is inaccurate to state that the Bolam test determines every issue arising in a medical negligence claim.

Bolam vs Bolitho vs Montgomery

These principles should not be treated as interchangeable. Their application depends on the precise issue being considered.

Does the Bolam Test Mean a Doctor Cannot Be Negligent If Another Doctor Agrees?

No.

The Bolam principle does not mean that a defendant automatically avoids liability whenever another medical professional supports the treatment.

Following Bolitho, the court can scrutinise the reasoning behind the professional opinion. The existence of supporting experts is therefore not necessarily decisive.

The quality, relevance and logical basis of the expert evidence remain important.

Similarly, where the dispute concerns informed consent, the Montgomery approach may apply rather than Bolam.

Bolam Test and Misdiagnosis

The Bolam principle can be relevant to allegations involving diagnosis.

Doctors frequently have to make decisions based on incomplete information. Symptoms can have several possible causes, and different investigations may reasonably be considered depending on the circumstances.

An allegation of negligent diagnosis therefore requires consideration of what a reasonably competent practitioner with the relevant expertise should have done in the circumstances.

Expert evidence may examine:

• The symptoms recorded at the relevant time
• The patient's medical history
• Examination findings
• Test results
• Differential diagnoses
• Clinical warning signs
• Referrals
• Follow-up arrangements
• The timing of investigations and treatment

The fact that a diagnosis was ultimately incorrect does not automatically establish negligence. The legal question is whether the diagnostic process fell below the required standard and, importantly, whether any breach caused actionable harm.

Bolam Test and Surgical Negligence

Surgical negligence claims can also involve the Bolam and Bolitho principles.

Potential issues may include whether:

• Surgery was clinically indicated
• An appropriate surgical technique was selected
• Relevant risks were identified
• The procedure was performed to the appropriate standard
• Complications were appropriately recognised and managed
• Post-operative monitoring was adequate
• Further treatment or referral was required

Expert evidence should ordinarily come from a professional with appropriate expertise in the relevant surgical discipline.

A poor outcome does not necessarily demonstrate negligent surgery. Surgical procedures can involve recognised complications even when reasonable care has been provided.

Bolam Test and Medication Errors

Medication-related allegations can involve questions about prescribing, dosage, contraindications, interactions, monitoring and follow-up.

The applicable professional standard may depend on the circumstances and the healthcare professional involved.

For example, an expert may need to consider whether the prescription was appropriate given the patient's:

• Medical history
• Existing medication
• Symptoms
• Diagnosis
• Age and other relevant clinical characteristics
• Known contraindications
• Test results
• Clinical circumstances at the time

Again, the assessment concerns the standard of professional care rather than simply whether an adverse reaction occurred.

Why Expert Witnesses Matter in Clinical Negligence Claims

A well-prepared medico-legal report can help establish the factual and clinical basis of a negligence allegation.

A suitable medical expert should be able to distinguish between:

• A recognised complication and negligent treatment
• A legitimate difference in clinical judgment and substandard care
• An unavoidable outcome and avoidable injury
• A clinical breach and the consequences actually caused by that breach

The expert should also remain within their area of expertise and clearly explain the reasoning supporting their conclusions.

For solicitors, a strong report should address the relevant questions clearly rather than simply stating that a healthcare professional was or was not negligent.

Is the Bolam Test Still Used?

Yes, the Bolam principle remains relevant to the assessment of clinical negligence, particularly questions concerning the standard of professional clinical care. However, its application has been qualified by subsequent case law.

Bolitho requires professional opinion relied upon to have a logical basis, while Montgomery established that informed consent and disclosure of material risks are assessed using a patient-centred approach rather than traditional Bolam reasoning.

Therefore, describing modern clinical negligence law simply as "the Bolam test" can be misleading. The correct legal approach depends on the precise issue in dispute.

Key Points About the Bolam Test

The main principles can be summarised as follows:

• The Bolam test originated from Bolam v Friern Hospital Management Committee [1957].
• It concerns the professional standard of care in clinical negligence.
• A difference between medical opinions does not automatically establish negligence.
• Professional evidence is particularly important when assessing clinical standards.
• Bolitho requires the supporting professional opinion to have a logical basis.
• Montgomery changed the approach to informed consent and material risks.
• The Bolam test does not, by itself, establish causation or damages.
• An adverse medical outcome does not automatically mean that negligence occurred.
• The precise expertise and reasoning of a medical expert can be highly significant in a clinical negligence case.

Conclusion

The Bolam test remains an important part of UK clinical negligence law, but it should be understood alongside the developments that followed the original 1957 decision.

For questions concerning diagnosis and treatment, the court may consider whether the healthcare professional acted in accordance with responsible professional practice, while Bolitho requires the relevant professional opinion to withstand logical scrutiny. For informed consent, Montgomery introduced a distinct patient-centred approach focused on material risks and reasonable alternatives.

For solicitors assessing a potential clinical negligence claim, understanding these distinctions is essential when identifying the appropriate expert evidence and framing the issues that an expert must address.