sterility assurance level
Also written as: SAL — sterility assurance level
Statistical measure expressing the probability of a viable microorganism surviving sterilization.
Full Definition
Sterility assurance level (SAL) is a statistical concept that quantifies the probability of a single viable microorganism surviving a sterilization process. It is expressed as a negative logarithm, with SAL 10^-6 meaning a one-in-a-million chance of survival, which is the standard for most medical devices. The SAL is determined through validation studies using biological indicators with known resistance to the sterilization method. Different medical devices may require different SAL levels based on their intended use and patient risk assessment. Understanding SAL is crucial for selecting appropriate sterilization parameters and validating sterilization processes.
Usage
Usage note: Always express as scientific notation (10^-6) rather than decimal equivalent in technical documents.
In Context
- "The sterilization process must achieve a sterility assurance level of 10^-6 for implantable devices." — Validation protocol documentation
- "Biological indicator studies confirmed the process delivers the required sterility assurance level." — Quality control report