Saturday, 2 July 2016


It "is the extent to which a specific intervention, procedure, or service produces the desired effect, under ideal conditions (controlled environment, laboratory circumstances)." Efficacy is equal to effectiveness; only circumstances change. For example, "the efficacy of vaccine A was achieved under ideal laboratory circumstances, yet, its effectiveness needs to be shown."
Bibliographic references: (n.d.). Effectiveness, Efficiency, and Efficacy : Definition - Health Care and Health Care Informatics Terms - Define Efficiency, Effectiveness, and Efficacy. [online] Available at: [Accessed 2 Jul. 2016].