Final answer:
The first action a PCT should take upon entering the room to perform a phlebotomy procedure is to wash hands thoroughly with soap and water.
Step-by-step explanation:
When preparing to perform a phlebotomy procedure on a patient, the first action that a PCT should take upon entering the room is Wash hands thoroughly with soap and water. This is important to prevent the spread of infection and ensure patient safety. After washing hands, the PCT should then proceed to confirm the patient's identity and explain the procedure, gather necessary equipment and supplies, and ask the patient about any allergies to latex.