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An unexpected bacterial or mould air result should prompt a structured review of the sample, method and investigation objective. It does not automatically identify a source or establish a facility-wide problem. Begin by confirming what the report actually measured.
Review the sample ID, collection location, collection date, requested analysis, reported units, qualifiers, and laboratory analytical method.
Clearly distinguish a count result (enumeration) from a selected-target qualitative finding (presence/absence). If any reporting notation or detection qualifier is unclear, contact PBR for laboratory clarification before drawing operational or regulatory conclusions.
Check the equipment model, collection medium lot, sampled air volume where applicable, sample handling temperature, and transport duration.
Consider whether collection occurred under environmental and operational conditions directly comparable with baseline or earlier monitoring samples. Review field logs for unusual human traffic, HVAC servicing, severe weather events, or production downtime during sampling.
Use only a valid specification or investigation criterion established for the specific project or facility program.
Historical data is informative only when the collection media, instrument calibration, flow rates, and analytical methods support direct comparison. Do not create a universal "safe" or "unsafe" threshold from an isolated laboratory result.
Review physical inspection findings, moisture surveys, process observations, and complementary sample matrices (such as surface swabs or product quality data).
Detection of an organism in an air sample identifies a recovery under specific conditions; it does not locate the contamination source. While a count increase may warrant investigation, the appropriate next step depends on the method and the specific operational decision being addressed.
The responsible environmental consultant, QA director, or facility manager should determine whether additional air sampling, physical inspection, process re-engineering, or surface sampling is needed.
Simply re-testing the exact same spot without an investigative hypothesis or corrective action does not establish the root cause or demonstrate that an underlying concern has been resolved.
For mould concerns in indoor environments, air microbiology results must not be treated as a medical health diagnosis or a blanket building-safety certificate. Health Canada does not recommend routine residential mould testing and has established no numerical exposure thresholds.
Review the analytical findings alongside qualified engineering and environmental assessments within the full context of the building investigation.
Have your laboratory test report, field collection record, project acceptance criteria, and specific investigation question ready when contacting PBR.
A well-defined operational question makes it straightforward for our technical team to discuss method clarification and the available analytical follow-up services.