Air and surface sampling can help identify the types and concentrations of mold captured in the areas tested. Results are interpreted by considering the mold species identified, total concentrations, indoor-to-outdoor comparisons, sampling locations, marker molds, hyphal fragments, and evidence of current or previous moisture.

It is important to understand that this testing provides a limited snapshot—not a complete picture of everything present within a home or building. An air sample collects a relatively small volume of air from one location during a brief period. Surface testing represents only the specific area sampled. Contamination may be present elsewhere without being captured in that particular sample.

Results can also vary based on humidity, airflow, HVAC operation, disturbance, occupancy, weather, and other conditions at the time of testing. Concealed contamination within walls, ceilings, flooring systems, insulation, subflooring, crawlspaces, attics, or HVAC components may not be reflected in the laboratory results.

For these reasons, air and surface testing are most useful when evaluated alongside a comprehensive environmental assessment, moisture readings, building history, occupant observations, and other available evidence.