CSTD stands for

• A. Closed-System Transfer Device
• B. Containment Ventilated Exposure
• C. Biological Safety Cabinet
• D. High Efficiency Particulate Air filter

Answer: (A)

CSTDs are designed to prevent exposure to hazardous drugs by maintaining a closed transfer path during drug handling. This reduces the chance of aerosolization, leaks, or spills when preparing and delivering chemotherapy and other hazardous medications. The term refers to devices that create a sealed barrier for transferring the drug between vials, syringes, and administration systems, so the worker and the environment stay protected. That’s why Closed-System Transfer Device is the correct expansion of the acronym.

The other options describe different equipment or concepts not used to denote a transfer device: a Biological Safety Cabinet is a containment cabinet with filtered airflow for safe handling of hazardous materials but isn’t what CSTD stands for; a High Efficiency Particulate Air filter is a component used in many containment devices, not the device itself; and the term Containment Ventilated Exposure isn’t a standard designation for a device used in hazardous-drug transfer.