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Understanding your mold test results
Lab reports can be confusing. Here's how to read them.
Air samples: compare indoor to outdoor
There is no single safe number for mold spores. Air results are read by comparing indoor samples with the outdoor control. Indoor counts that are noticeably higher, or mold types that are present indoors but rare outdoors, suggest an indoor source.
Surface samples: what's growing
Swab and tape-lift results show whether mold growth is present on that surface and which types were identified.
Water-damage indicator molds
Some molds, such as Stachybotrys and Chaetomium, typically grow on materials that have stayed wet for a long time. Finding them often points to a moisture problem worth investigating.
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