Which of the following statements is true concerning quality control of a blood gas analyzer?
a. Commercially prepared controls ensure instrument accuracy.
b. A Levy-Jennings chart is used to record quality control data.
c. Protein buildup on electrodes will not cause errors in the instrument.
d. Commercial controls are not susceptible to variations at room temperature.
ANS: B
The most common method of recording quality control data involves the use of Levy-Jennings charts. These charts allow the operator to detect trends and shifts in electrode performance, which helps prevent problems associated with reporting of inaccurate data because of analyzer malfunction. Commercially prepared control systems provide information on the instrument's precision—not the accuracy of the data—and are susceptible to variations in room storage tem-perature.
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