You are asked to calibrate an O2 analyzer. Which of the following gases would you use for this procedure? 1. 100% oxygen 2. 50% oxygen 3. 21% oxygen (room air)
a. 1 and 2 only
b. 1 and 3 only
c. 2 and 3 only
d. 1, 2, and 3
ANS: B
To obtain accurate results with an O2 analyzer, the clinician first must calibrate it according to manufacturer's recommendations. Although procedures differ according to the manufacturer, the basic steps are similar, requiring exposure of the sensor to two gases with different O2 concentra-tions, usually 100% O2 and room air (21% O2). In one common procedure, the sensor is first ex-posed to 100% O2. If the analyzer fails to read 100%, the device's calibration, or balance control, must be adjusted until it reads 100%. Then, the clinician exposes the sensor to room air and con-firms a second reading of 21% (?2%). The clinician should use the analyzer to measure a pa-tient's FiO2 only after confirming both readings.
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