What is the standard of care required by a medical professional to treat a patient in a motor vehicle accident?

The standard of care is not one of perfection. Rather, the standard of care must be one that would be expected of an ordinary, reasonable, and prudent person in the same circumstances. What is “reasonable” is fact specific, including the likelihood of a known or foreseeable harm, the gravity of that harm, and the burden or cost which will be incurred to prevent the injury. One may also look to external indicators of reasonable conduct, such as custom, industry practice and statutory or regulatory standards: Ryan v. Victoria (City), 1999 CanLII 706 (SCC), [1999] 1 S.C.R. 201 at 28.