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## Sterility assurance level
## Additional recommended knowledgeIn microbiology it's impossible to prove that all organisms have been destroyed because: 1) they could be present but undetectable simply because they're not being incubated in their preferred environment and 2) they could be present but undetectable because their existence has never been discovered. Therefore SALs are used to describe the probability that a given sterilization process has destroyed all of the microorganisms. ## TerminologyMathematically, SALs referring to probability are usually very small numbers and so are properly expressed as negative exponents ("The SAL of this process is 10 to the minus six"). SALs referring to the sterilization efficacy are usually much larger numbers and so are properly expressed as positive exponents ("The SAL of this process is 10 to the six"). In this usage, the negative effect of the process is sometimes inferred by using the word "reduction" ("This process gives a six-log reduction"). Because of this ambiguity, group discussions of SAL must define the terminology before setting standards. SALs can be used to describe the microbial population that was destroyed by the sterilization process. Each log reduction (10 SALs describing the "Probability of a Non-Sterile Unit" are expressed more specifically as PNSU in some literature. ## References |

This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Sterility_assurance_level". A list of authors is available in Wikipedia. |