Reasons Why You Should Not Use a DIY Mold Testing Kit

Posted on

Reasons Why You Should Not Use a DIY Mold Testing Kit

Homeowners may be tempted to try testing for mold themselves with a DIY Mold testing kit, by setting out petri dishes for a period of time, to determine if there is mold present inside their home. This method is misleading and inaccurate for many reasons. The results lack enough credibility that lawyers, doctors, insurance companies, and remediation companies do not accept the results.

Here are some of the problems with DIY Mold Testing Kits:
  • No Expiration Dates – DIY mold test kits sit on hardware shelves or storage areas for undisclosed amounts of time, subjecting the agar (gooey stuff) to contaminants. Because there is no readily identifiable expiration date for these kits, despite the requirement that they be sterile, consumers cannot determine how much potential handling or exposure these kits have had.
  • No Inspection – DIY kits do no provide an overall understanding of your mold contamination. A critical part of a comprehensive mold investigation is the inspection process, which requires specialized instruments such as digital moisture meters, hygrometers, infrared cameras and other tools.
  • No Control Sample – A control sample is necessary to validate the elevation of spores and provide a meaningful reference point, but many DIY kits do not offer a dish to take such a comparison sample from another room or outside.
  • No Air Flow to Measure Mold In Cubic Units- Most standards and guidelines refer to mold spores per cubic meter or coliform forming unit, but obtaining a level of mold per volume of air is impossible without a controlled airflow through the use of a mechanical pump.
  • No Accredited Laboratory Certification, Endorsement or Chain of Custody – The labs associated with DIY kits are rarely certified (those listed with AIHA-LAP LLC Accredited Labs) and are not endorsed by any accredited agency. Often there is no chain of custody (COC) to properly document the transfer of the kit or to note acceptance of the kit by the lab and critical data such as the date, time of analysis, lab location etc. are often omitted.
  • Misleading Marketing/Information – Consumers often think that the DIY kit they purchase will quantify and qualify the types of mold they have, but this is not the case. For an additional cost, the petri dishes must be sent out to the lab for analysis (see point 1, 2, 3 for why this is meaningless).
  • Kits Do Not Account For Dead Spores: Settling plates and other DIY kits are focused on growing mold, but dead spores can also impact your health. Water damage-makers such as Stachybotrys, Chaetomium and Ulocladium may not show up on the DIY kit.
  • Spore Characteristics – Mold spores have unique weight, density and air flow characteristics and do not settle at the same rate. Heavier spores, for example, settle on the petri dishes at a quicker rate and take up more of the sample plate. Sticky molds, especially water damage indicators and Black Mold, might not appear as readily on the DIY kits, but this absence could indicate greater growth elsewhere.

Overall, Mold Testing DIY kits are useless for diagnosing if you have a mold problem and should be handled by a professional, who uses proper sampling collection protocol and a certified lab. Also, a professional can assist with interpreting the results so the customer understands the situation fully. Do not waste your time and money on a DIY Test, instead contact a trusted mold professional.
Visit Comprehensive Mold Management's website for more information at


  1. Hi! I read your blog. Its so nice.Today's homes are completely waterproof so a good cleaning of ducts and air exchangers regularly, with the help of specialized equipment, will guarantee you a quality air at all times and in all your rooms. You detect moisture, condensation in your windows? Your windows are all fogged? These are certainly telltale signs that you need experts like Exl-Gold Cleaning to check and clean your air exchangerNettoyage Conduits D'air

  2. Thank you for your articles that you have shared with us. Hopefully you can give the article a good benefit to us. Mold Removal Bensalem