Journal
What ATP testing can and cannot tell you
ATP meters give a quick reading of organic residue on a surface. Here is how to use the numbers sensibly.
What the meter measures
ATP, or adenosine triphosphate, is a molecule found in living cells and in many foods. A swab picks up residue from a small area, and a meter reports a relative light unit value that rises with the amount of organic material.
It is widely used as a fast check of how well a surface has been cleaned.
Why one number is not a verdict
The reading depends on the surface, the swab technique and the meter. It does not tell you which organisms are present, and a low number does not mean a surface is sterile or safe in a medical sense.
Comparisons are more meaningful. Testing the same spot before and after cleaning shows whether the residue actually came off.
How we use it
We offer it as an optional measurement and record it in your report with the location and time. It is a cleanliness indicator only and is never presented as a health finding.