Which of the following actions by the phlebotomist caring for a patient in isolation is contraindicated?

Bringing a phlebotomy tray into the room is contraindicated because it can potentially introduce contamination into the controlled environment of the isolation room. In isolation settings, strict protocols are in place to minimize the risk of spreading infectious agents. Items that are not specifically sanitized or designed for use in isolation may carry pathogens and compromise the safety of the patient and healthcare workers.

In contrast, wearing gloves when entering the room is a critical practice that helps prevent the transmission of microorganisms. It is an essential part of personal protective equipment (PPE) that minimizes the risk of contact with potentially infectious materials.

Taking notes outside the room is also appropriate as it helps to maintain the integrity of the isolation environment by preventing unnecessary items from entering the space.

Using hand sanitizer after leaving the room is a fundamental practice in infection control, ensuring that any potential contaminants are removed from the healthcare worker's hands before they interact with other patients or areas.