What RLU range indicates that surfaces are "marginally acceptable"?

The range of 10-20 RLU (Relative Light Units) is identified as "marginally acceptable" for surfaces. This classification is significant in assessments of microbial contamination and cleanliness, particularly in environments that might be affected by trauma or crime scene cleanup.

When surfaces fall within this RLU range, it indicates the presence of organic material or microbial populations that may not pose an immediate health risk but may warrant further cleaning or monitoring. Surfaces with RLUs in this range should be evaluated for cleanliness and regularly checked, as they are not considered ideal but also do not represent a severe contamination issue.

Lower RLU readings would suggest a cleaner surface, while higher readings indicate increasing levels of contamination. The "marginally acceptable" label for the 10-20 RLU range thus serves as a guideline for professionals, advising them to maintain vigilance and consider additional cleaning procedures to ensure health and safety standards are met.