Glossary · Doctrine
Res Ipsa Loquitur
A common-law doctrine, Latin for 'the thing speaks for itself,' that allows an inference of negligence from the mere occurrence of certain types of injury, used in malpractice cases involving retained surgical objects, wrong-site surgery, and similar.
Also known as: res ipsa, the thing speaks for itself
What it is
Res ipsa loquitur is a common-law doctrine, Latin for "the thing speaks for itself," that allows the jury to infer negligence from the mere occurrence of an injury when (1) the injury is of a type that ordinarily does not occur absent negligence, (2) the instrumentality causing the injury was within the defendant's exclusive control, and (3) the plaintiff did not contribute to the injury. The doctrine relieves the plaintiff of having to prove a specific negligent act when the circumstances themselves establish that something went wrong.
Classic malpractice applications
Res ipsa is most commonly invoked in malpractice for:
- Retained foreign objects: surgical sponges, instruments, or guidewires left inside the patient.
- Wrong-site surgery: operating on the wrong limb, organ, or patient.
- Anesthesia injuries during routine procedures in otherwise healthy patients.
- Burns, falls, and equipment failures during procedures requiring patient unconsciousness.
In these cases, the plaintiff often cannot identify the specific person responsible (the patient was anesthetized) but the injury itself bespeaks negligence.
Effect on the case
Where res ipsa applies, the burden of producing evidence shifts to the defendant to explain the injury. Practically, the doctrine is a powerful settlement lever; cases involving retained objects or wrong-site surgery typically settle quickly because the defense has limited room to contest liability.
In settlement strategy
Identify res ipsa applicability at intake. Cases that qualify can often be evaluated and resolved on damages alone, with liability essentially conceded.
See Also
- Standard of Care — The level of skill, diligence, and judgment a reasonably competent practitioner in the same specialty would exercise under similar circumstances, used as the benchmark for proving negligence in a malpractice case.
- Breach of Duty — The element of a negligence claim that requires the plaintiff to prove the defendant's conduct fell below the applicable standard of care.