When professional mold testing is conducted, there are steps that the commercial cleaning contractor follows. These steps may be used for an initial inspection to determine the type of mold present at the facility. This professional mould testing inspection identifies the areas that show visible mold and those prone to growing mold shortly due to conducive conditions such as water leaks.

The commercial cleaning contractor may then conduct a moisture assessment and air sampling. In this step, the contractor tests the moisture levels as they favor mold growth. They may take surface samples after identifying the area of high humidity using the correct tools. Surface samples of the visible mold are assumed to be assessed and analyzed in the lab to determine the type of mold present in the facility.