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. Author manuscript; available in PMC: 2016 Jun 1.
Published in final edited form as: Ther Drug Monit. 2015 Jun;37(3):389–394. doi: 10.1097/FTD.0000000000000168

Figure 1.

Figure 1

Diagram of an ideal assay with a constant CV%. The assay SD gets smaller and smaller as the measurement approaches zero, and ideally is zero when the measurement is zero.