What is a biosafety cabinet and when is it used?

• A. A biosafety cabinet is a sealed, ventilated enclosure that protects worker and sample by filtering air; used when handling infectious materials (BSL-2 or higher)
• B. A biosafety cabinet is a portable storage cabinet for PPE
• C. A biosafety cabinet is a bench-top incubator
• D. A biosafety cabinet is a cabinet used to hold non-hazardous reagents

Answer: (A)

Biosafety cabinets provide a sealed, ventilated workspace that protects both you and the materials you’re handling by filtering air through HEPA filters and directing airflow to contain aerosols. This containment is crucial when working with infectious materials or other hazardous biological agents, typically at biosafety levels 2 and higher, because it minimizes exposure to you and prevents contamination of the environment and the sample. In practice, you use a biosafety cabinet during procedures that generate aerosols or splashes—like pipetting, mixing, or culturing infectious organisms—so that contaminants stay contained and the work area remains clean.

This isn’t simply a storage or furniture solution. A unit meant for PPE storage, or a bench-top incubator, or a cabinet used to hold non-hazardous reagents all fail to provide the necessary containment and air filtration needed when handling infectious materials.