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Res ipsa loquitur meaning

What does Res ipsa loquitur mean?
An evidential doctrine in negligence (delict in Scotland) allowing the court to infer negligence from the very nature of an accident where the claimant/pursuer cannot prove the precise act or omission. Not defined in legislation, it is a common‑law label used across England & Wales, Scotland, Northern Ireland and Ireland. It typically applies where: (1) the occurrence is of a kind that ordinarily does not happen without negligence; (2) the “thing” causing the damage was under the defendant’s management or control; and (3) the claimant/pursuer lacks a specific explanation. Its effect is to create a prima facie case and shift an evidential burden to the defendant to offer a plausible non‑negligent explanation. The legal burden of proof remains with the claimant/pursuer. Common contexts include falling objects, unexplained transport mishaps, shop spillages, and retained surgical items. It is unlikely to assist in complex clinical negligence or technical product liability where expert evidence is required. If the defendant rebuts the inference or shows an equally probable non‑negligent cause, the doctrine does not apply. Usage and effect are broadly consistent across the UK and Ireland, with Scottish courts expressing the principle in delictual terms but treating it as the same evidential inference rather than a...
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View the related Practice Notes about Res ipsa loquitur

PRACTICE NOTES
Proving negligence in personal injury claims: balance of probabilities, evidential inferences, res ipsa loquitur and conviction-based presumptions

Balance of probabilities The claimant is required to establish, on the balance of probabilities, that the defendant was negligent or failed to comply with their statutory duties. Succeeding on the balance of probabilities means demonstrating that something is more likely than not. If the claimant’s material is as consistent with negligence as with its absence, or with breach of duty as with none, the claim will not succeed. Where the defendant has been convicted of an offence arising from the alleged negligent conduct, a rebuttable presumption arises that the offence was committed. In such a situation, the burden of proof is reversed. It then falls to the defendant to demonstrate, on the balance of probabilities, that there was no negligence...

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PRACTICE NOTES
Surgical negligence claims: applying Bolam/Bolitho, consent after Montgomery, inherent risks and never events, orthopaedic, spinal and general surgery issues, and evidence, experts and res ipsa loquitur

Across the range of clinical negligence matters spanning ‘pure diagnosis’ to ‘pure treatment’, allegations arising from careless surgical performance almost invariably fall at the treatment end. That remains the position even when an operation is chiefly undertaken for diagnostic, rather than therapeutic, purposes. As a result, any impugned acts or omissions will be assessed by reference to the standard Bolam approach, tempered by Bolitho considerations. See Practice Note: Duty of care and breach in clinical negligence claims. Professional guidelines Clinical guidance issued by the National Institute for Health and Care Excellence (NICE) provides helpful evidence of the standards expected in surgery; this is explored further in the Practice Note: NICE Guidance. The Royal College of Surgeons likewise produces extensive materials on recognised surgical techniques and patient management, for example the Good Surgical Practice document. Alongside national guidance, NHS Trusts frequently issue local protocols on topics such as infection control, failed intubation, and prevention of venous thrombo-embolism. Departing from such guidelines or policies does not, of itself, amount to...

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PRACTICE NOTES
Causation in clinical negligence: 'but for', material contribution, risk, loss of chance, apportionment, intervening acts, remoteness and informed consent

Khan v Meadows In Khan v Meadows, the Supreme Court outlined a framework for analysing the constituent parts needed to establish negligence, including the scope of duty and causation. For further guidance, including on the limits of the defendant’s duty of care, see Practice Note: Duty of care and breach in clinical negligence claims. Causation has two elements that a claimant must demonstrate: Is the loss a consequence of the defendant’s act or omission? (the factual causation question) Is any part of the harm unrecoverable because it is too remote, because there is another effective cause (including an intervening act that broke the chain of causation), or because the claimant has mitigated their loss or failed to avoid loss they could reasonably have avoided?...

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