What action is generally required when test results indicate 20+ RLU?

When test results indicate a reading of 20 or more relative light units (RLU), it typically signifies a level of contamination that exceeds acceptable limits for safe environments, such as areas handled by a Trauma and Crime Scene Technician. In such cases, the presence of biological and potentially harmful contaminants necessitates a thorough re-cleaning to eliminate any health risks associated with pathogens that may be present.

The rationale for requiring re-cleaning lies in the need to ensure the safety of the environment and prevent any possible exposure to harmful substances. Cleaning with the appropriate disinfectants and methodologies is critical, as it helps to achieve a lower RLU count, thereby confirming that the area is safe for use and free from harmful contaminants. This emphasizes the importance of maintaining hygienic standards, especially in trauma and crime scenes where the potential for harmful materials is high.

The other choices do not address the critical need for comprehensive cleaning when elevated RLU levels are detected. Minimal cleaning or no action could leave harmful pathogens in the area, and immediate closure may be overly drastic if the correct cleaning measures are taken. Thus, re-cleaning is a necessary remedial step to ensure ongoing safety and compliance with health standards.