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Cannabis Testing

Missouri's Only Physician-Lead Cannabis Testing Facility

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Cannabis Testing Services

Get the best cannabis & marijuana testing services in the state of Missouri

Cannabis, or marijuana, testing refers to the qualitative and quantitative analysis of flower, extracts and manufactured products intended for consumption.  Analysis is done using various chromatographic techniques.  Chromatography refers to the separation of individual components from complex mixtures, or compounds, based on differential characteristics of the components.  Specific techniques vary based on which components are being analyzed for.

Potency and Safety Testing Overview

Cannabis potency and safety testing must be performed by a licensed, accredited laboratory to evaluate for active ingredients (primarily cannabinoids and terpenes) in a medicinal sample, and to rule out possible contaminating substances that may have been inadvertently introduced during cultivation, manufacturing, or storage of product.

cannabinoid profile

Cannabinoid Profile

Knowing the levels of individual cannabinoids and terpenes present in a product can help predict the effects of ingested, inhaled or topically applied product.  Cannabinoid and terpene profiles vary based not only on the genetics of a specific strain, but also on the environment under which the plants are cultivated and the stage of maturity at which the plants are harvested.  Levels also vary based on the rate and degree to which plants are cured, so considerable variability exists even within a specific genetic strain.  Using Waters Acquity UPLC platform, GPA offers a 10-Cannabinoid profile for any product.

Safety Testing

Potential contaminants such as pesticides, heavy metals, residual solvents, microbial pathogens and mycotoxins can also be incorporated into plant material during cultivation, manufacturing or storage, and must be analyzed for so that products may be certified safe for medical use.

Cannabis Testing in Missouri

GPA Labs is licensed to test medical cannabis products that originate in Missouri. We can also test Hemp and CBD products from anywhere in the US.  State-mandated test requirements vary slightly based on the type of product being certified, but generally require a panel of safety and potency testing, and are required to confirm accuracy of product labeling.

terpene testing

Cannabis Terpene Testing

Terpenes are volatile aromatic compounds that give different cannabis strains their characteristic and recognizable aromas, like pine, hops, berry, diesel, and citrus.   Additionally, terpenes have biologic activity and can bind to, activate, and modify endocannabinoid receptors, acting together with cannabinoids to modulate their activity through what is known as the “entourage effect”.  Geneticists, breeders, and cultivators often select for different and specific terpene profiles in order to achieve the desired effect of a flower or manufactured product.  Terpene profile and activity are likewise integral to achieving the desired effect from CBD products derived from hemp.

Due to their volatile nature, GPA utilizes a liquid injection technique using Waters GC/MS/MS technique to accurately identify and quantify the terpenes present in flower, extract, and manufactured products from cannabis and hemp.  GPA tests for the full 23-terpene panel.

Testing for Contaminants in Cannabis

microbial testing

Microbial Screening

Cannabis flower, concentrate, and infused or manuactured products for sale in Missouri must be tested for microbiological contaminants including mycotoxins (aflatoxins and ochratoxin A), pathogenic E. coli and Salmonella, Aspergillis species A. fumigatus, A. niger, and A. terreus. GPA uses Medicinal Genomics qPCR technology and the Agilent AriaMx real-time thermal cycler for detection of microbiologic contaminants.  GPA then goes one step further, and any positive PCR tests reflex to culture using selective media.

Pesticide Screening

Pesticide Screening

Products also must be tested to ensure that levels of 66 specific chemical analytes do not exceed allowable limits.  GPA utilizes Waters LC/MS/MS for pesticide screening of cannabis products.

Heavy Metals Testing

Heavy Metals Testing

Cannabis products in Missouri will be tested for the presence of heavy metals including arsenic, cadmium, chromium, lead, and mercury.  GPA utilizes state of the art technology with PerkinElmer’s ICPMS (Inductively Coupled Plasma Mass Spectroscopy) 1000 system for heavy metals contamination testing.

Residual Solvent Testing

Residual Solvent Testing

Cannabis products for inhalation and Medical marijuana-infused products are required to be tested to ensure that allowable levels of 20 different residual solvents are not exceeded.  GPA employs Agilent Gas Chromatography coupled with Waters Mass Spectroscopy for Residual Solvent analysis.

Water Activity and Moisture Content

Water Activity and Moisture Content

Dried unprocessed marijuana must be assessed to ensure that water activity does not exceed 0.65 aw and moisture content is between 5% and 13%.  A Sartorious Moisture Balance is used to evaluate moisture and water content.

Foreign Matter Screening

Foreign Matter Screening

Products must be certified that they contain no more than 5.0% (by weight) of stems 3 mm or more in diameter, and no more than 2.0% (by weight) of other foreign matter including mites, hair, dirt, etc. GPA uses a Cyclops 2.0 Digital microscope with a zoom of up to 140x, allowing us to accurately inspect and photograph your products.

Meet the Team

the experience you need for the best results

cannabis hemp cbd ceo

Paul Joslin


cannabis hemp cbd lab director

Josh Kollmeyer

MLS (ASCP), Laboratory Director

cannabis hemp cbd coo

Anthony David


cannabis hemp cbd logistics

Vicky Shade

Logistics Director

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