The Nurse Is Preparing to Perform a Modified Allen Test

The nurse is preparing to perform a modified Allen test. Which is an appropriate reason for this test?

A) To measure the rate of lymphatic drainage
B) To evaluate the adequacy of capillary patency before venous blood draws
C) To evaluate the adequacy of collateral circulation before cannulating the radial artery
D) To evaluate the venous refill rate that occurs after the ulnar and radial arteries are temporarily occluded