Final answer:
In this situation, you should apologize to the mistaken patient, call the correct patient back, and inform a supervisor or manager.
Step-by-step explanation:
In this situation, you should apologize to the patient for the mistake and reassure them that their information will remain confidential. Then, you should immediately call the correct patient back to the phlebotomy chair to prevent any further confusion. It is important to communicate effectively with the patient and explain the situation, ensuring that their privacy is protected. Additionally, you should inform a supervisor or manager about the incident so that proper documentation and follow-up can occur.