Assistant Laboratory Animal Technician (ALAT) Practice Exam

Why is it important to remove organic matter before disinfecting a surface?

1. Organic matter enhances the effectiveness of disinfectants

2. Some disinfectants are inactivated in the presence of organic matter

3. Organic matter provides nutrients for microorganisms

4. Organic matter has no impact on disinfectants

The correct answer is: Some disinfectants are inactivated in the presence of organic matter

The importance of removing organic matter before disinfecting a surface lies in the fact that some disinfectants can be rendered ineffective when they come into contact with organic matter. This is because organic materials, such as blood, feces, and other biological substances, can interact with the active ingredients in disinfectants. This interaction can lead to a reduction in the disinfectant's ability to kill or inactivate harmful pathogens, meaning that the intended disinfection may not occur effectively. For instance, certain disinfectants may form complexes with organic debris or may be neutralized by it, significantly diminishing their antimicrobial properties. Therefore, to ensure that disinfectants can achieve their intended purpose of sanitizing surfaces and minimizing the risk of infection or contamination, it is essential to first clean the surface thoroughly to remove any organic material. This step helps to maximize the efficacy of the disinfectant used afterward, ensuring a safer and more sterile environment.