The Respiratory Therapist Places a Face Mask on an Infant

The respiratory therapist places a face mask on an infant to measure FRC. What should the therapist do to minimize the presence of air leaks and improve accuracy of the test?

A) Place a nose clip on the infant.
B) Minimize the amount of helium used during the test.
C) Minimize oxygen concentration and increase nitrogen concentration.
D) Apply petroleum jelly on the edges of the mask before applying the mask to the face.