Bolitho v City and Hackney Health Authority
[1997] UKHL 46; [1998] AC 232
House of Lords
Lord Browne-Wilkinson, Lord Slynn, Lord Nolan, Lord Hoffmann, Lord Clyde
Decision: 13 November 1997
Background
Patrick Bolitho, a two-year-old child suffering from croup, experienced two episodes of significant respiratory distress while admitted to hospital. Nursing staff urgently contacted the responsible paediatric registrar, Dr Horn, requesting medical review.
Despite being alerted, neither Dr Horn nor a deputy attended.
Patrick subsequently suffered a complete airway obstruction leading to respiratory arrest, cardiac arrest, severe brain injury and ultimately death.
The Health Authority admitted that Dr Horn’s failure to attend amounted to a breach of duty. The central dispute was whether that breach caused the injury.
The legal issues
The House of Lords considered two distinct questions:
- what Dr Horn would have done if she had attended.
- whether that decision would itself have been negligent.
The second question required consideration of the scope of the Bolam principle.
The decision
The House of Lords dismissed the appeal.
The trial judge had found:
- Dr Horn would not have intubated Patrick even if she had attended.
- A respected body of paediatric opinion considered that decision acceptable.
- Therefore it was not established that earlier attendance would have prevented the injury.
The House of Lords upheld those findings.
The Bolam test
The court reaffirmed the principle from:
Bolam v Friern Hospital Management Committee [1957] 1 WLR 582.
A clinician is not negligent if acting in accordance with a practice accepted as proper by a responsible body of skilled professional opinion.
Before Bolitho, this was often interpreted as meaning that support from a responsible body of experts would effectively defeat a negligence claim.
The Bolitho qualification
The landmark contribution of the case was Lord Browne-Wilkinson’s refinement of Bolam.
The court held that judges are not bound automatically to accept expert opinion simply because respected experts sincerely hold it.
Instead, expert opinion must be capable of withstanding rational scrutiny.
The crucial passage states:
“The court is not bound to hold that a defendant doctor escapes liability… just because he leads evidence from a number of medical experts who are genuinely of opinion that the defendant’s treatment or diagnosis accorded with sound medical practice.”
The relevant body of opinion must be:
- responsible.
- reasonable.
- respectable.
- logically defensible.
The logical analysis test
Lord Browne-Wilkinson explained that a court must ensure that experts have genuinely:
- considered relevant risks.
- considered anticipated benefits.
- balanced those risks and benefits.
- reached a defensible conclusion.
A court may reject expert evidence where:
- it lacks coherent reasoning.
- it ignores obvious risks.
- it fails to evaluate benefits and disadvantages.
- it cannot withstand logical scrutiny.
Accordingly:
Professional opinion is necessary, but not always sufficient.
How difficult is it to satisfy Bolitho?
The House of Lords emphasised that this power should be exercised only rarely.
Lord Browne-Wilkinson stated:
“It will very seldom be right for a judge to reach the conclusion that views genuinely held by a competent medical expert are unreasonable.”
Therefore:
- Bolam remains the general rule.
- Bolitho operates as a narrow safeguard.
The court does not choose between competing respectable schools of medical thought merely because it prefers one.
Judicial intervention is justified only where the supporting professional opinion is not logically defensible.
Causation and omissions
A further important principle concerns clinical omissions.
The court held that where negligence consists of a failure to act, causation requires examination of a hypothetical question:
What would have happened if the doctor had fulfilled their duty?
In such cases the court must distinguish between:
- the factual question of what the doctor would actually have done.
- the legal question of whether that action, if itself negligent, would have breached the standard expected of a competent doctor.
This distinction remains central in modern causation analysis.
Further significant principle
The House of Lords confirmed:
A defendant cannot escape liability by arguing that, had they avoided the original breach, they would merely have committed another negligent act later.
The standard against which causation is assessed is one of proper and competent medical care.
Why the claim failed
Although Dr Horn was negligent in failing to attend:
- the trial judge accepted evidence that she would not have intubated.
- respected paediatric experts supported that decision.
- their opinion was logically defensible.
- therefore failure to intubate would not itself have been negligent.
Accordingly, the claimant could not prove that the admitted breach caused the catastrophic injury.
The appeal was dismissed.
Practical significance
Bolitho remains one of the most important authorities in clinical negligence law because it established that:
- Courts retain ultimate responsibility for determining the legal standard of care.
- Professional opinion is influential but not conclusive.
- Expert evidence must be logical and reasoned.
- Clinicians must be able to justify decisions through a defensible risk-benefit analysis.
- Bolam and Bolitho operate together, not as competing tests.
Modern statement of the principle
The standard is commonly summarised as:
A healthcare professional will generally not be negligent if acting in accordance with a responsible body of professional opinion (Bolam), provided that opinion is itself reasonable, responsible and capable of withstanding logical analysis (Bolitho).
This remains the foundation of modern English clinical negligence law.