2.2. The Three Levels of Decontamination

💡 First Principle: Decontamination is not one thing — it is a hierarchy with three distinct levels, each more thorough than the last. Which level you need depends on the item's contact risk. Using a lower level when a higher one is required leaves pathogens alive.

The three-level hierarchy is one of the most tested concepts on the exam. The exam will present scenarios asking which level is appropriate for a given item or situation. The key is knowing not just the names, but what each level achieves and what it does not achieve.

⚠️ Common Misconception: "Disinfection" sounds complete and absolute, so students often use it interchangeably with "sterilization." They are not the same — disinfection leaves bacterial spores alive. Only sterilization destroys all microbial life. This distinction is directly tested on the exam.