The Student Nurse Observes the Respiratory Therapist (RT) Preparing to Draw

The student nurse observes the respiratory therapist (RT) preparing to draw an arterial blood gas from the radial artery.  The RT performs the Allen's test and the student asks why this test performed before the blood sample is drawn.  Which statement made by the RT is most accurate?

A) "The Allen's test is done to determine if capillary refill is adequate."
B) "The Allen's test is done to determine if the radial pulse is palpable."
C) "The Allen's test is done to determine the patency of the ulnar artery."
D) "The Allen's test is done to determine the presence of a neurologic deficit."

Correct Answer:

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