Phlebotomy Technician Practice Exam (NCPT/CPT)

Before entering an isolation room, it is important to take all necessary precautions to prevent the spread of any potential infectious agents. This includes leaving the phlebotomist's tray outside the room, as bringing it inside could potentially introduce contaminants into the sterile environment.

Disinfecting the tray (A) may not be enough to eliminate all potential pathogens, and covering it with plastic (B) may not fully prevent contamination. Taking the tray into the room but covering the contents (D) may still pose a risk of introducing contaminants. Thus, the best option is to leave the tray outside the room.