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Table 1 Distribution of ATP-bioluminescence values (RLU) in the different RODAC categories (CFU/plate)

From: ATP bioluminescence assay for evaluating cleaning practices in operating theatres: applicability and limitations

ATP-bioluminescence assay

RODAC categories

No growth

Expected value TVC ≤ 5 CFU/plate

Acceptable value TVC: 6–15 CFU/plate

Not acceptable TVC > 15 CFU/plate

N: 74

N: 57

N: 6

N: 3

Geometric mean (CI 95%) RLU/100 cm2

29.2 (23.6–36.1)

34.7 (25.6–46.9)

51.7 (13.9–191.5)

74.8 (na)

Median (Range) RLU/100 cm2

29 (4–480)

30.5 (4–510)

48 (10–480)

63 (27–233)

Number of samples with discordant results (cut off: 100 RLU/100 cm2)

7 (9.5%)

10 (17.5%)

1 (16.7%)

2 (66.6%)

  1. CI, Confidence Interval
  2. na: not applicable