Clinical Medical Assistant Exam Practice Question

Correct Answer: A

Rationale: Option A is appropriate as it instructs the patient to take a deep breath and blow hard into the mouthpiece, which ensures a sufficient exhalation for accurate measurement of breath alcohol content.

Option B is incorrect because inhaling deeply through the mouthpiece does not provide the necessary exhalation for the test.

Option C suggests breathing normally, which may not generate enough airflow for accurate readings.

Option D is also wrong, as holding the breath prevents the necessary exhalation, compromising the test's validity.