Which of the following C-PECs should not be used to compound sterile hazardous drugs?

• A. Class 1 BSC
• B. Class 2 BSC
• C. CACI
• D. LAFW

Answer: (D)

The important idea is containment: hazardous drugs must be kept from escaping into the work environment and from contaminating the product during sterile compounding. For this, the primary engineering control (PEC) used is a containment-type cabinet or isolator that provides both worker protection and product protection, typically a Class II biological safety cabinet or a containment aseptic isolator (CACI). These devices contain any aerosols or vapors and filter air before it exits.

A containment device like a Class II BSC or a CACI is designed to capture and filter hazardous substances and keep them from the worker and the surrounding area, making them appropriate for sterile hazardous-drug compounding when properly installed and operated. In contrast, a horizontal laminar flow workbench (LAFW) is intended mainly to protect the product from environmental contamination by supplying filtered air across the work area, but it does not provide containment of hazardous drug vapors or protect the worker from exposure. It recirculates air and does not reliably exhaust hazardous materials to the outside, so it is not suitable for sterile hazardous-drug compounding.

So, the LAFW should not be used for sterile hazardous drug compounding; the safer choices are the containment cabinet or isolator options that provide proper containment and filtration.