A medical assistant should recognize that which of the following procedures is usually performed by a registered nurse?

A. Avoiding intense eye contact: Avoiding intense eye contact is generally respectful and can be appropriate depending on cultural norms.
B. Reassuring the patient by touching them: In some Muslim cultures, physical contact between individuals of the opposite gender who are not family members may be considered inappropriate.
C. Maintaining distance from the patient: Maintaining a respectful distance is generally appropriate and often preferred in various cultures.
D. Using gestures cautiously: Using gestures cautiously is respectful and avoids miscommunication.

Correct answer: C
A. Taking aspirin within 12 hr of testing: Aspirin does not generally impact spirometry results.
B. Using sedatives within 1 hr of testing: While sedatives might affect breathing, they are not commonly noted as a significant factor for spirometry test preparation.
C. Exercising 2 hr prior to testing: Exercise can temporarily affect lung function, so it's advised to avoid vigorous exercise before a spirometry test to ensure accurate results.
D. Eating a heavy meal 4 hr prior to testing: Although a heavy meal might cause some discomfort, it is less likely to affect the spirometry results compared to exercise.