What's Actually on a Cannabis Lab Report? A Beginner's Guide to COAs
Cannabis products come with a lot of numbers. Percentages, abbreviations, and test categories that can feel overwhelming if you’ve never looked at one before. But that little document, called a Certificate of Analysis or COA, is one of the most useful tools you have as a cannabis consumer. It tells you exactly what’s in the product you’re buying, and learning how to read it takes less time than you’d think.
What Is a COA and Why Does It Exist?
A Certificate of Analysis is a lab report issued by a third-party testing facility. In Missouri, licensed dispensaries are required to carry products that have been tested by an accredited lab, which means every product on our shelves has a COA attached to it. The whole point of this document is transparency. It verifies potency, checks for contaminants, and confirms that what the label says matches what’s actually inside the package.
The Potency Section: THC, CBD, and the Rest
The first thing most people look at is the potency panel. This is where you’ll find the cannabinoid breakdown, including THC, CBD, CBG, CBN, and others. You’ll usually see two numbers: the percentage of each cannabinoid and sometimes the total milligrams per gram or per serving. For flower, THC is listed as both THCA (the raw, non-psychoactive form) and Delta-9 THC (the active form after heat). Total THC is the number that actually matters for understanding how potent a flower will be after you smoke or vaporize it. For edibles and extracts, the active THC content is already calculated for you.
Terpenes: The Section Most People Skip
Below the cannabinoid panel, most COAs include a terpene profile. Terpenes are the aromatic compounds that give cannabis its distinct smell and flavor, but they do more than that. Research suggests terpenes interact with cannabinoids to shape your overall experience, a concept often called the entourage effect. Common terpenes you’ll see listed include myrcene (earthy, relaxing), limonene (citrusy, uplifting), and caryophyllene (spicy, often associated with stress relief). The higher the percentage of a terpene, the more present it will be in the aroma and effect profile. A robust terpene panel is often a sign of a quality, well-grown product.
Residual Solvents and Pesticides: The Safety Tests
This section is where the COA does its most important consumer protection work. Residual solvent testing applies mainly to concentrates and extracts. During the extraction process, solvents like butane or ethanol are used to pull cannabinoids from the plant. Testing confirms that those solvents were properly purged from the final product and that levels are below the state’s legal limits. Pesticide testing checks for agricultural chemicals that may have been used during cultivation. You want all of these to come back as “ND,” which stands for Not Detected, or within the acceptable threshold listed on the report.
Microbials, Mycotoxins, and Heavy Metals
These three categories round out the safety testing panel. Microbial testing looks for things like mold, yeast, E. coli, and salmonella. Mycotoxins are toxic compounds that can be produced by certain molds. Heavy metals testing checks for contaminants like arsenic, lead, cadmium, and mercury, which can make their way into cannabis plants through soil or water. Again, you’re looking for ND or values that fall within the legal safe range. A clean pass across all three of these categories means the product has met Missouri’s safety standards before it ever hit the shelf.
How to Actually Find a COA
Most cannabis brands print a QR code directly on their packaging. Scanning it usually takes you straight to the COA for that specific batch. You can also ask any of our budtenders at NatureMed and they can pull it up for you or help you walk through what you’re looking at. Some brands also post their lab results on their websites. Batch numbers on the label correspond to the batch number on the COA, so always make sure those match before you rely on the document.
Shop Smarter at NatureMed
Now that you know what to look for, you can shop with a lot more confidence. Whether you’re checking potency before trying a new concentrate, scanning for your favorite terpene profile, or just making sure a product passed its safety tests, a COA gives you real information to work with. Our budtenders are always happy to help you find products that match what you’re looking for, and we keep a full selection of lab-tested cannabis across all five of our Missouri locations. Check out our daily deals to find great products at great prices, or browse our full online menu to see everything we currently have in stock.
