What is the standard to observe by a medical practitioner in the practice of his profession?

The standard to be observed by a medical practitioner in the practice of his profession is well established. In Wilson v. Swanson, 1956 CanLII 1 (SCC), [1956] S.C.R. 804, 5 D.L.R. (2d) 113, Rand J. said at p. 811: “In the presence of such a delicate balance of factors, the surgeon is placed in a situation of extreme difficulty; whatever is done runs many hazards from causes which may only be guessed at; what standard does the law require of him in meeting it? What the surgeon by his ordinary engagement undertakes with the patient is that he possesses the skill, knowledge and judgment of the generality or average of the special group or class of technicians to which he belongs and will faithfully exercise them.”