What is the most appropriate action if a galvanic fuel cell cannot be calibrated while analyzing FiO2 for a neonate?

When a galvanic fuel cell cannot be calibrated while analyzing the fraction of inspired oxygen (FiO2) for a neonate, changing the fuel cell is the most appropriate action.

Galvanic fuel cells are sensitive devices that measure the concentration of oxygen in a gas by generating a small electrical current that is proportional to the amount of oxygen present. These devices have a limited lifespan due to the depletion of their internal components, which includes the electrolyte and sensor chemicals. If calibration fails, it typically indicates that the fuel cell itself may be malfunctioning or has deteriorated to the point where it can no longer accurately respond to changes in oxygen levels.

By changing the fuel cell, you are likely to restore its ability to provide accurate measurements, which is critical in managing a neonate's care, especially regarding oxygen therapy. Regular maintenance, including the replacement of the fuel cell as needed, ensures that accurate FiO2 measurements are consistently available to guide clinical decisions.

Other methods, such as checking the electrolyte level or replacing the battery, may not be sufficient to resolve calibration issues, as the core function of the measurement relies heavily on the integrity of the fuel cell. Similarly, obtaining a mass spectrometer, while it could provide accurate readings, would not be