Feedback of ATP Measurement as a Tool for Reducing Environmental Contamination in Hospitals in the Dutch/Belgian Border Area.

Background & objective: The objective of this study was to determine the effect from feedback of ATP measurements on environmental contamination within hospitals in the Dutch/Belgian border area. Setting: Standardized ATP measurements were conducted in 9 hospitals on pre-defined fomites. Four different fomite groups were defined: medical devices, patient bound materials, ward bound materials and sanitary items. ATP results were reported in relative light units (RLU), RLU >1000 was considered as “not clean.” Two rounds of ATP measurements were conducted. After the first round of ATP measurements, results were provided to the wards. There were no structured cleaning interventions implemented. The second round of ATP measurements was performed one year later. The amount of surface contamination before and after the feedback were compared. Results: In total 1923 ATP measurements were performed. Before feedback 960 ATP measurements were conducted and after feedback 963. The overall median reduction in RLU was 381 (p<0.001), from 568 before feedback to 187 afterwards. In each hospital there was a reduction of the median RLU after feedback. Conclusion/discussion: Substantial reductions in RLU values were found after feedback of ATP measurements. Feedback of ATP measurements was associated with a major reduction of surface contamination in hospitals.