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4.  ATP Testing 

A 

# ATP Testing

measurement 

A rapid verification method that measures adenosine triphosphate to estimate surface bioburden.

## Definition

ATP is present in all living cells and organic residues. Swab-and-luminometer testing converts ATP into a Relative Light Unit (RLU) reading in about 15 seconds.

## Why it matters

ATP testing verifies cleaning effectiveness objectively. Visual inspection catches soil; ATP catches invisible organic residue that supports microbial growth.

## Practical applications

Establish RLU pass/fail thresholds per surface type. Audit high-touch points after each cleaning cycle and trend results by shift and location.

## Related terms

[Cross Contamination](/knowledge-center/glossary/cross-contamination)[Disinfection](/knowledge-center/glossary/disinfection)[ATP Swab](/knowledge-center/glossary/atp-swab)[Available Chlorine](/knowledge-center/glossary/available-chlorine)[Dilution Ratio](/knowledge-center/glossary/dilution-ratio)[Free Available Chlorine (FAC)](/knowledge-center/glossary/free-available-chlorine)

## Referenced in

-   [When Is an Operating Theatre Safe to Reopen? A Guide to Terminal Cleaning and Environmental Verification](/knowledge-center/articles/guide-to-terminal-cleaning)
-   [How Does ATP Testing Work?](/knowledge-center/articles/how-does-atp-testing-work)

## Need help applying this?

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