Which method constitutes HIGH RISK terminal sterilization?

Which method constitutes HIGH RISK terminal sterilization?

• A. Autoclave at 121C
• B. CSP solutions passed through a filter with porosity < 1.2 micron before or during filling into final containers
• C. Ethylene oxide gas sterilization
• D. Filtration through a 0.22 micron filter in Class 5 environment

Answer: (B)

High-risk CSPs should be sterilized after they are packaged in their final containers whenever possible. That final-step sterilization is what we mean by terminal sterilization. Steam autoclaving (moist heat at 121°C) is a classic terminal sterilization method used after filling and sealing. Ethylene oxide gas sterilization is another terminal option for materials that can’t tolerate heat or moisture, though residues must be carefully removed before use. Filtration approaches—whether filtering CSP solutions before or during filling, or filtering through a small-pore membrane in a Class 5 environment—are aseptic processing steps. They remove contaminants but do not sterilize the final container in the way terminal sterilization does. A 0.22 μm (or similar) filter during aseptic filling is not considered terminal sterilization; it’s a way to achieve sterility without applying a terminal sterilization process to the final product. So, the true terminal sterilization methods among these are the autoclave and the ethylene oxide processes, while filtration steps are aseptic methods, not terminal sterilization.

High-risk CSPs should be sterilized after they are packaged in their final containers whenever possible. That final-step sterilization is what we mean by terminal sterilization.

Steam autoclaving (moist heat at 121°C) is a classic terminal sterilization method used after filling and sealing. Ethylene oxide gas sterilization is another terminal option for materials that can’t tolerate heat or moisture, though residues must be carefully removed before use.

Filtration approaches—whether filtering CSP solutions before or during filling, or filtering through a small-pore membrane in a Class 5 environment—are aseptic processing steps. They remove contaminants but do not sterilize the final container in the way terminal sterilization does. A 0.22 μm (or similar) filter during aseptic filling is not considered terminal sterilization; it’s a way to achieve sterility without applying a terminal sterilization process to the final product.

So, the true terminal sterilization methods among these are the autoclave and the ethylene oxide processes, while filtration steps are aseptic methods, not terminal sterilization.