What does activating a safety device on the needle prevent?

Activating a safety device on the needle is primarily designed to prevent accidental needle sticks. This is an important safety measure for healthcare workers, as needle stick injuries can lead to serious health risks, including the transmission of bloodborne pathogens such as HIV and Hepatitis B and C. The safety device typically retracts or covers the needle after use, minimizing the risk of re-injury and safeguarding both the healthcare professional and their patients.

While other options may relate to the broader context of safe phlebotomy practices—such as reducing contamination or infection risks—the specific function of a safety device on a needle is to enhance safety by preventing accidental injuries during or after the procedure.