[Qualification of low temperature vaporized hydrogen peroxide sterilization: Towards greater harmonization of...

Comparing performance qualification procedures for low temperature vaporized hydrogen peroxide sterilization. Assessing conformity with draft standard ISO/DIS 22441.

Qualification reports from several providers have been compared according to specific criteria: choices of cycles, loads, sterile barrier systems, probes, biological and chemical indicators; checking of packaging integrity and exposure to sterilizing agent.

Six out of 8 reports based on 4 distinct sterilizers have been performed by third-party providers. Routine and process challenge devices are respectively used in 6 and 3 of these reports. Sizes and masses are never mentioned whereas load configuration is always specified. All reports use at least one biological indicator and 50% of them use one chemical indicator at a minimum. Most frequent wrapping materials are Ultra® and Tyvek® bags (respectively 50% and 37.5% of reports). Each qualification monitors per process pression and temperature, and 37.5% of them also quantify hydrogen peroxide concentration. Packaging integrity and environmental exposure are checked in respectively 50% and 12.5% of all reports. All reports have received providers approval.

Qualification procedure is based on steam sterilization NF EN 14937 standard, which seems unsuitable for low temperature process. The lack of autonomy, the heterogeneity of loads and measurement choices reveal a low harmonization of practices. New standard should dispel the doubts about this heterogeneity.