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An air microbiology result describes a submitted sample under the selected collection and laboratory method.
To interpret it, begin with the test requested, the result format, the sampling conditions and the decision the result needs to support.
Separate enumeration from presence/absence. Enumeration measures a count under the selected method. Presence/absence reports whether the specified target was detected. Do not interpret a non-detection as a numerical zero or a count as proof of species identity.
For a detailed side-by-side comparison, read Air Enumeration versus Presence/Absence Testing.
Check sample identity, collection location, collection date, equipment or medium, sampled air volume where applicable and laboratory method. Keep the report’s units and qualifiers attached to every result when comparing data.
Learn what records are critical during collection in Planning Air Microbiology Sample Collection and Submission.
Comparisons require attention to collection method, analytical approach, sampling conditions and purpose. Counts produced through different approaches should not be treated as interchangeable. An outdoor or other comparison sample can be considered where specified by the investigation plan; it is not a universal requirement for every project.
Detection identifies a finding in the submitted sample under the test conditions. It does not independently establish a source, exposure risk, facility-wide condition or a need for a particular remedial action. A low result likewise does not automatically demonstrate that a concern is resolved.
Review the project objective, inspection or process observations and relevant historical data. The project professional or QA team determines what wider investigation is needed. Contact PBR to discuss method clarification or additional analysis that answers the next analytical question.
Health Canada does not recommend routine residential mould air testing and has not established a health-based indoor mould exposure limit.
Do not use a mould air result to predict health effects or certify building safety. Health-related concerns belong with an appropriate healthcare professional. For supported fungal testing methods, review Mould Air Testing.
Have the report, sample record, method information and project question available when contacting PBR. A clear question makes it easier to discuss the relevant laboratory follow-up.
Review our step-by-step checklist in What to Do After an Unexpected Air Microbiology Result.
No. It means the selected target was not detected under the test conditions in the submitted sample.
They describe different sample types and often different units. They should not be treated as equivalent measurements.
No. The result needs method and investigation context; it is not a standalone health or building-safety assessment.
Discuss analytical methods, reported units, and investigation follow-up with our laboratory scientists at PBR Laboratories.