Mold test results from DIY home mold tests are often misleading or simply wrong (i.e. due to sampling error). It’s best to have a professional take the test and interpret the results.
Home Mold Test Kits don’t include a visual inspection conducted by a mold professional which is very beneficial! A professional mold inspection includes not only sampling, but a comprehensive visual inspection to detect issues and problems related to mold that are not apparent to most people without training in building sciences and mold inspections.
Mold is everywhere. Yes, all homes have small amounts of mold. Therefore, when a petri dish from a home mold test tells you that you have mold, it is not telling you anything particularly useful since every home has mold!
If you suspect a mold problem but do not actually see it or smell it, these test kits do little to help you locate the problem or tell you how serious it is.