When is environmental surface sampling performed in hazardous drug programs?

• A. Only during initial program setup.
• B. During routine daily operations.
• C. Only after spills and if not needed.
• D. During audits or after changes.

Answer: (D)

Environmental surface sampling is a quality assurance activity used to verify that containment and cleaning controls are working effectively. It’s most appropriate to perform this testing during audits or after changes to the compounding process, equipment, layout, or workflow. After changes, sampling checks that the new setup hasn’t introduced surface contamination and that cleaning and containment measures still function as intended. During audits, sampling serves as a formal check that the entire program remains compliant and effective over time.

Routine daily operations aren’t typically the time you rely on for environmental surface sampling, since ongoing monitoring is managed through other controls and routine cleaning checks. Sampling after spills can be important for remediation, but it’s not the sole or primary driver for ongoing environmental monitoring—audits and changes drive the systematic verification of the program’s effectiveness.