PRO-LAB MO109 Professional Mold Test Kit

The PRO-LAB MO109 is the best-selling professional mold test kit among DIY homeowners, combining the convenience of at-home sample collection with the accuracy of a certified laboratory analysis. Unlike instant test kits that only tell you mold is present (something almost always true in any occupied home), the MO109 identifies which specific mold species you have and quantifies the spore concentration — information that's genuinely actionable for health and remediation decisions.

The kit includes everything needed to conduct four different sampling methods. The Air Sampling method (most commonly used) involves leaving a prepared petri dish open on a flat surface in the suspect area for one hour — the settling plate passively captures airborne spores. The Surface Sampling method uses a swab to collect spores directly from a visible moldy surface. Additional methods provide options for sampling materials or HVAC contamination.

After sampling, seal your petri dish or swab sample and ship it to PRO-LAB's laboratory using the included prepaid mailer. PRO-LAB is certified by the American Industrial Hygiene Association (AIHA) — one of the most rigorous independent certifications in environmental testing. Their lab team identifies mold to the genus level (e.g., Aspergillus, Cladosporium, Stachybotrys) and provides an interpretation of whether your levels are typical or elevated, along with health context and recommended next steps.

For the $40 lab analysis fee (separate from the $9.99 kit price), this is one of the most cost-effective ways to get professional-grade mold identification before committing to expensive professional remediation.