While assessing the Levy-Jennings graphs for partial pressure of carbon dioxide in the arterial blood (PCO2) values, you notice that the results for the last five quality assessment (QA) tests have increased progressively. Which of the following is the most likely cause of this finding?
a. A leak in the electrode membrane
b. Protein buildup on the electrode
c. A damaged wire
d. This is a normal membrane function.
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