Which Actions Are Correct When the Nurse Is Performing the Allen's

Which actions are correct when the nurse is performing the Allen's test?. Select all that apply.

A) Occlude the radial artery and, after 15 seconds, occlude the ulnar artery.
B) Ask the patient to hold the hand below waist level for 30 seconds before beginning the test.
C) Release pressure over the ulnar artery first.
D) Hold pressure on the radial artery for 30 seconds before assessing the hand.
E) Consider color return to the hand in 20 seconds as a negative test.