To confirm proper operation of an O2 blending system, what should you do? 1. Test low-pressure alarms and bypass systems. 2. Analyze FiO2 at 0.21, 1.00, and prescribed level. 3. Confirm air and O2 inlet pressures

a. 1 and 2 only
b. 2 and 3 only
c. 1 and 3 only
d. 1, 2, and 3


ANS: D
To confirm proper operation, the respiratory therapist always should conduct an operational check of any blender before using it on a patient (Box 41-3).

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