Simulating PUPSIT Or Gas Purges In Bacterial Challenge Tests

A robust contamination control strategy (CCS) is essential to maintaining sterility during aseptic processing, particularly at the stage of final sterile filtration. Among the critical considerations is pre‑use, post‑sterilization integrity testing (PUPSIT), which is designed to detect filter failures after sterilization but before product filtration. Evaluating the risks associated with PUPSIT requires a detailed understanding of sterilization methods, filter handling, wetting fluids, supply chain controls, and the potential for fouling or flaw masking. Process‑specific bacterial retention studies play a key role in demonstrating filter performance under worst‑case conditions and may incorporate simulated PUPSIT steps where appropriate. Additional practices, such as post‑filtration gas purging to maximize product recovery, further underscore the need for a comprehensive risk assessment.

Explore practical recommendations for integrating PUPSIT considerations into sterile filter validation and strengthening sterility assurance.