Home Inspection

Do Mold Test Kits Work? And How Accurate Are They?

Home mold test kits can (and cannot) be accurate tools for initial mold detection. But if we talk about offering a valuable “first step” in identifying potential mold problems then these kits can serve you pretty well. All that matters is that you use them correctly. They can then provide you with early warning and guide you on whether you need professional testing. So yeah, these mold testing kits do work but it all depends on different factors that we’ll be discussing later on. Before that, let’s have a look at how a mold testing kit works.

How to Test for Mold in House Using a Mold Test Kit?

To test for mold in your house, using mold test kits is a very convenient way. These kits let you collect samples from the areas where you suspect mold growth, whether through tape lift sampling, petri dish sampling, or air sampling. When testing for mold, you can carefully follow the instructions that come with the kit. However, usually, the process involves three basic steps: collecting the samples, sealing them and sending them to a laboratory, and later, experts analyzing those to identify the types and concentrations of mold present.

Let’s have a more thorough look at the steps.

Selecting the Right Kit

The very first step is selecting a mold testing kit that best suits your needs. There are several types of mold testing kits that you can choose from, including:

  • Tape lift sampling kits
  • Petri dish kits
  • Air sampling kits
  • Swab sampling kits
  • Bulk sampling kits

Each of these kits comes with a different set of instructions that you need to follow throughout the sampling process.

Identifying Sampling Locations

Once you have a suitable kit, you need to identify the areas in your home that are suspected of mold growth. You may also consider the areas where you noticed water damage, musty odor, or discoloration. Also, identify the areas from where you can take samples like basements, bathrooms, kitchens, or areas that might have leaks or moisture problems.

Collect Samples

The sample-collecting method varies from one testing kit to another. Let’s have a look at three of those below.

Tape Lift Sampling

The kit provides a simple adhesive tape that you can use to collect samples from the surfaces where you suspect mold. Press the tape firmly against the surface, then carefully peel it off and place it on a clean surface provided in the kit.

Petri Dish Sampling

Open the petri dish provided in the kit and expose the agar growth medium. Place the open dish in the suspected moldy area for a specified period, usually 1 to 2 hours. Close the petri dish and seal it according to the kit instructions.

Air Sampling

Set up the air sampling device according to the kit instructions and place it in the center of the room or area where mold growth is suspected. Allow the device to run for the specified sampling time, typically 10 to 15 minutes.

Seal and Label Samples

Once you have collected the samples, you shall seal them securely as it is asked in the kit instructions. Ensure that you’ve sealed it properly to prevent contamination. Then, you shall label each sample with the date, time, and location of the collection.

Send Samples to the Lab

Read and follow the instructions given on the kit for packaging and shipping the samples to the designated laboratory for analysis. At times, kits include prepaid shipping labels, but if not, then you need to pay for the shipping separately.


The laboratory will then analyze the samples. The major factors of the analysis will include identifying the types and concentrations of the mold present. The analysis step might take from several days to weeks. It all depends on the kit and the lab processing time.

Are Mold Testing Kits Accurate?

We can’t say for sure whether the mold testing kits are accurate, this is because their accuracy varies based on different factors. The factors that determine whether the mold testing kit works may include:

  • Type of kit
  • Proper use, i.e., precisely following the instructions given with the kit
  • Environmental conditions
  • Laboratory analysis

If you’re in search of the most accurate mold test kit, then you may choose an air sampling kit. These are generally considered the most appropriate ones for comprehensive assessments. Air sampling kits are effective at detecting airborne mold spores; they also provide detailed reports. But one thing that you need to ensure with air sampling kits is careful setup and handling.

On the other hand, tape lift and swab sampling kits are also highly accurate for detecting surface mold, and are also easy to use. However, they’re limited to specific areas. Whereas petri dish kits can be useful for initial detection and identification of mold presence, they might not offer the detailed analysis that air sampling kits offer.

How Much Are Mold Test Kits?

In California, mold testing kits can range from a minimum of $10 (basic kits) to a maximum of $200 (comprehensive professional kits).

You can choose the kit according to your needs – the level of detail and accuracy required. If you need a kit for general home use, then you can choose kits from the range of $20 to $50.


Mold poses major health, structural, and economic challenges in California because of the state’s diverse climate and frequent moisture issues. Mold testing kits can serve as the first step to detect mold that provides a cost-effective means to look for potential problems before they escalate, they can help in identifying mold presence early and determine whether there’s a need for professional mold testing.

Each type of mold test kit has its fair share of strengths and weaknesses. But when it comes to dealing with extensive mold issues, it’s better to choose professional testing to ensure a thorough and accurate inspection and remediation.

Discover peace of mind with AmeriSpec Inspection Services! Our expert team offers comprehensive mold testing to ensure your home is safe and healthy. Don’t wait until mold becomes a bigger problem—schedule your professional inspection today and protect your family and property.