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BEN EISEMAN, MD

Arch Surg. 1984;119(3):263.

	Since this article does not have an abstract, we have provided the first 150 words of the full text PDF and any section headings.

There are three valves on a trumpet. Even Louis Armstrong wove his magic using only the eight possible combinations of fingering. But if Satchmo blew three times, he could have 512 different combinations of valve depression.

The problem is similar in optimal sequencing, and also for surgeons trying to reach a diagnosis using the fewest laboratory tests in the least time and at the least cost. It has always been so, but suddenly has become relevant because of diagnosis-related groups and of the emerging number, complexity, and cost of diagnostic laboratory studies. The problem of sequencing, or precedent order, in its simplest form would involve only two tests (A and B), in which case there are three possible sequencing strategies. We could perform test A on the first day and test B on the second day. The sequence could be reversed, and finally both tests could be performed on the . . . [Full Text PDF of this Article]

Author Affiliations
Denver

Footnotes
If performed on one day, there is but one combination (A, B, C, D). If done on two days, there are 14 combinations. If spread over three days, there are 16 combinations, and if one test is done a day over the four days, there are 24 options. The sum of these (1+14+16+24) is 55.

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