What is Mold Testing?

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  • Written By: Mary McMahon
  • Edited By: O. Wallace
  • Last Modified Date: 11 November 2019
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Mold testing is a procedure which is performed to look for signs of mold in a building. While mold testing cannot necessarily identify the species of mold present, or where it is located, it can be used to gather information about mold populations. Some environmental quality agencies will conduct mold testing by request, and people can also order testing through private labs, which will sometimes send out representatives and sometimes send out a test kit for people to collect samples with.

One of the important things to be aware with when conducting tests to look for mold is that mold is naturally present in all structures. Molds are very diverse, and not all of them are harmful. It would be extremely surprising to conduct a mold test and see no signs of mold, so when a test is positive, it does not necessarily mean that there is a problem. Mold tests also provide only a sampling of a particular point in time, which means that all of the molds present may not be identified, and if toxic molds are present, the mold testing will not determine whether or not they are emitting toxins.


Some mold testing is conducted with handheld sniffers which check for spores of specific molds in the air. These sniffers can be sensitized to detect particular mold genera or species, providing a quick assessment of the types of mold which may be present. Other testing involves collection of samples from areas where mold tends to grow, including samples from mold colonies which can be analyzed to determine what kind of mold is growing.

People sometimes request mold testing because they are convinced that molds are causing health problems, or because they plan to use the results of the testing to pursue legal action against someone else. Consumers should be aware that mold testing varies widely in scope and quality, and that it can be easy to waste a lot of money on testing for mold. If, for example, mold colonies are present in a home, tenants can document the colonies and ask their landlord to take action if the mold is growing because of something the landlord did, and they don't need to conduct mold testing to determine whether or not mold is present, since the mold is clearly visible.

If people detect the smell of mold or see a mold colony, they should track down the colony, eliminate it, and remove the source of moisture which is allowing the mold to grow. Mold testing in these situations is generally not necessary, unless the structure has a documented problem with toxic molds and there are concerns that special measures may need to be taken during cleanup to avoid inhaling mycotoxins or spreading spores by accident.


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Post 3

@Feryll - I disagree with @Sporkasia about calling a professional rather than using an at home mold testing kit. If you use the kit and find mold then you may be able to remove it yourself with a simple bleach and water solution.

I have used this mixture of water and chlorine bleach on both the outside and inside of my house and it works well. You just spray the areas where the mold is located and then let the solution go to work. You probably won't even have to scrub or even wipe. Be sure to wear a mask so you don't inhale the mold spores or fumes from the bleach mixture.

Post 2

@Feryll - You should consider having a professional who offers mold testing services come out to your house and test your home. for mold. As the article says, all mold is not harmful and all harmful mold is not always active, so if you buy a home testing kit and get a positive reading for mold you still cannot be certain whether you have an active and toxic mold growth problem or something that is harmless.

And since most houses have some type of mold, any home test you do will probably be positive. Then you'll have to contact a professional anyway to have the mold removed and to see whether it is toxic.

Post 1

I have been concerned about mold in the house we recently bought. For one thing, we have had a leak in the roof and water has been leaking into the attic whenever it rains. This of course is not good. On top of this, we have not had a working attic fan, so the temperatures in the attic were very high last summer.

The combination of water and hot temperatures make our attic a good breeding ground for mold. We haven't had any tests done as of yet, but I hope to get some type of mold testing done soon. I was surprised and relieved to read in this article that not all mold is necessarily going to cause us major problems. I thought all mold was hazardous to your health before reading this.

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