An Automated Blood Gas Analyzer Displays Acceptable Calibrations with No

Multiple Choice

An automated blood gas analyzer displays acceptable calibrations with no electrode drift noted.Multiple-level QC shows values for PCO₂ and PO₂ that are within 2 SD of the mean,but all pH values are more than 3 SD above the mean.Which of the following is most likely the cause?

A) Buffers are contaminated.
B) Calibration gas is contaminated.
C) Analyzer temperature is not 37° C.
D) Gas-liquid correction factor is set too low.