There is no single "pass" ATP score that applies everywhere. Hygiena's most widely used luminometers (SystemSURE Plus with UltraSnap swabs) come factory-set at roughly 10 RLU as a pass and 30 RLU as a fail, while its more sensitive EnSURE and EnSURE Touch devices, 3M Clean-Trace, and healthcare-specific research studies use different scales entirely — often in the hundreds of RLU. The right number depends on the device, the swab chemistry, and your own validated protocol, never on a figure copied from another site.
What does an ATP test actually measure?
ATP (adenosine triphosphate) bioluminescence testing swabs a surface, mixes the sample with a reagent, and measures the light produced in a handheld luminometer, reported as RLU (relative light units). ATP is present in any living or organic residue — food, skin cells, microorganisms, biofilm — so a high reading indicates residual soiling, not a specific microbial count. It is a rapid proxy for "has this surface been properly cleaned", used alongside, not instead of, visual inspection and, in clinical settings, microbiological testing.
Why is there no single pass/fail number?
Different manufacturers' luminometers are calibrated differently, so RLU readings from one system are not directly comparable with another. Hygiena's own EnSURE and EnSURE Touch devices, for example, are roughly twice as sensitive to light as its older SystemSURE Plus — so a site using EnSURE typically reprogrammes its thresholds rather than reusing the SystemSURE Plus defaults. The swab and reagent chemistry (Hygiena's UltraSnap vs 3M's Clean-Trace, for instance) also affects the numbers you will see. This is exactly why the brief for this page insists on "typical" ranges rather than one number: quoting a single universal RLU figure would be misleading.
Typical pass/caution/fail ranges you will see quoted
Hygiena SystemSURE Plus / UltraSnap (general surfaces, factory default): Pass at or below roughly 10 RLU, Caution around 11-29 RLU, Fail at 30 RLU or above. Hygiena documents this default as based on years of food and beverage processing experience and third-party studies — it is a starting point, not a fixed universal rule.
Hygiena EnSURE / EnSURE Touch (more sensitive devices): because these read roughly double the sensitivity of SystemSURE Plus, sites commonly reprogramme limits around 20 RLU (pass) and 60 RLU (fail) rather than reusing the SystemSURE Plus defaults.
Healthcare high-touch surfaces (published studies, not one fixed standard): peer-reviewed reviews of ATP use in hospital cleaning audits report thresholds ranging far higher than the food-hygiene defaults above — one widely cited study categorised readings as under 250 RLU ("cleaned"), 250-500 RLU ("probably cleaned") and over 500 RLU ("not cleaned"), while others have proposed benchmarks around 100 RLU for high-touch points. These healthcare figures vary between studies and devices, and are not interchangeable with the food-hygiene defaults above.
The take-away: if someone quotes you "the" ATP pass score without naming the device, swab and setting it applies to, treat that number with caution.
So what should you actually do?
Ask your cleaning contractor which luminometer and swab they use, and whether the thresholds are the manufacturer's factory default or a locally validated figure. Where it matters — clinical and food-handling environments especially — the more rigorous approach is to set your own threshold from a baseline: test a set of known-clean and known-dirty surfaces on your own device and set Pass/Caution/Fail around what that baseline shows, then keep the same device/swab/threshold combination over time so results are comparable month to month. Treat ATP as one input into a wider cleaning-verification programme, alongside visual inspection and, where relevant, microbiological sampling — not as a replacement for either.
Where ATP testing fits your compliance programme
For healthcare and CQC-regulated sites, ATP monitoring typically sits alongside an infection-prevention-and-control (IPC) audit schedule and the cleaning standards your contract specifies. See our guides on NHS cleaning standards and IPC audit preparation for how this fits a wider compliance programme, and our clinical and infection-control cleaning service for how we run verification on healthcare contracts.