When analyzing a blood gas control sample, you notice that the result falls outside the 2 SD range. How could you verify that this was a random error (error of imprecision)?
1. Repeat the analysis on a different analyzer.
2. Compare the control to an actual patient sample.
3. Rerun the control sample a second time.
a. 1 and 2 only
b. 1 and 3 only
c. 2 and 3 only
d. 1, 2, and 3
ANS: B
Table 19-3 outlines the major factors causing these two types of error and suggests some common corrective actions.
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