True or False: A vertical flow laminar hood can be used in sterile compounding.

• A. Sometimes
• B. Depends on the hood
• C. True
• D. False

Answer: (D)

The key idea is how airflow direction affects maintaining sterility. In sterile compounding, you want clean air to sweep across the work surface in a way that moves any contaminants away from the sterile product toward an exhaust, preserving an ISO 5 environment at the point of use. A vertical flow laminar hood pushes air downward onto the work area, which can cause room contaminants to fall into the sterile field and offers less reliable protection for the product. Horizontal laminar flow hoods, with air moving from back to front, are the type typically used for sterile compounding because they create a more protective, unidirectional flow for the prepared material. Therefore, a vertical flow laminar hood is not appropriate for sterile compounding.