Statistically derived limits for internal quality control of blood gas samples are usually set at what appropriate level?
a. 1 standard deviation from the mean
b. 2 standard deviations from the mean
c. 3 standard deviations from the mean
d. 5 standard deviations from the mean
ANS: B
In one common approach, the results of control media analyses are plotted on a graph and com-pared with statistically derived limits, usually ±2 standard deviation (SD) ranges (see Figure 19-9).
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