Cannabis Total Yeast and Mold (TYM)

The results of a Total Yeast and Mold (TYM) test are an indication of yeast and mold contamination on a cannabis sample. One Plant DNA Collection Kit is included with the price of each test. Each kit collects one sample and you will need one kit for each plant that you want to test. Shipping will be calculated during checkout. All taxes are included


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Total Yeast and Mold

The results of a Total Yeast and Mold (TYM) test are an indication of yeast and mold contamination on a cannabis sample.

Yeasts and molds can cause deterioration and decomposition of foods, which is why food manufacturers will commonly test their products for TYM. Certain species of yeast and mold, such as Aspergillus fumigatus, produce toxins that can cause potentially fatal infections.

However, TYM tests are unable to differentiate between pathogenic, beneficial, and benign yeast and molds, making them poor indicators of safety. A low TYM result does not mean a cannabis sample is free of pathogens. A high TYM result doesn’t mean a sample is harmful to consumers. This is especially true in cannabis, which has a diverse microbiome of beneficial microbes that are not harmful to humans.

Many cannabis regulators require cannabis samples pass TYM testing before they can be sold in dispensaries. Our testing is not suitable for these purposes and is available for research use only. Many states use pass or fail criteria for microbial testing recommending less than 10,000 CFU/g on cannabis plant material and 1,000 CFU/g on extracts but it is up to you to determine the requirements of your local regulations. In order to maintain the best possible concordance with plating, the TYM assay does not include certain species that fail to culture. Powdery Mildew and Botrytis are two such species and are therefore omitted in the assay design.


Who requires TYM testing?


*Only required for select matrices, view each page for more information



Why Use qPCR for TYM testing on Cannabis?

Peer-reviewed studies have shown that qPCR testing methods are able to more accurately detect and quantify yeast and mold species present on a cannabis sample than culture-based methods. TYM testing is analogous to a more quantitative version of the internal control built into our Powdery Mildew Screening, because it targets a specific DNA sequence that exists in all yeasts and molds. Because of this, the TYM test can detect all yeast and mold species, regardless of whether they grow in culture. Culture-based tests can only detect the species that grow in a given medium and timeframe. Conversely, qPCR can more effectively exclude off-target microbial species, such as bacteria, which have been shown to grow in TYM culture medium.


For Research Use Only



We developed a simple method to collect microbial DNA samples from your plants. This enables anyone in the world to take advantage of our services because our kits produce a purified DNA sample which is 100% legal to mail. All you need are the same materials (tweezers, alcohol, etc) required for any of our other tests. If you would like to test something other than plant material please contact us before placing your order. 

All testing is offered for research purposes only and not valid for regulatory certification.

Cannabis Total Yeast and Mold (TYM)


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