While performing duplicate blood gas analyses, a pulmonary function technologist notes that the second instrument gives

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While performing duplicate blood gas analyses, a pulmonary function technologist notes that the second instrument gives consistently higher values forPaCO2 and PaO2. Which of the following is the most probable cause of higher readings from the second instrument?

A. The sample chamber temperature is greater than 37° C
B. An excessive delay occurred between running the two samples
C. The PO2 and PCO2 electrode membranes have protein build-up
D. The sample chamber has a bacterial contaminate