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Figure 1

Figure 1. From: The laboratory test utilization management toolbox.

A hypothetical oscillating laboratory value (signal) with a period of approximately 48 days is measured once every 1 (A), 4 (B), 12 (C) and 31 (D) days.

Geoffrey Baird. Biochem Med (Zagreb). 2014 Jun;24(2):223-234.

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