Convenience is an expectation of life these days, from bank machines to cellular phones to fast food. The medical world is not immune to this drive. There is a continual effort to push testing to the lowest level of professional skill possible, in order to allow patients easy access to the information they need to live their lives more fully. The ultimate in this battle is to make systems that patients can use by themselves, at home.
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Lance S. Kuhn (1998) studied this question.