How to Read a Certificate of Analysis (COA): What Customers Should Actually Look For
One of the most common recommendations we make at North Georgia Smoke Shop is that customers look for products supported by third-party testing. Most consumers have heard this advice before. They have seen QR codes on packaging, references to laboratory testing on websites, and marketing claims centered around transparency and quality. Yet many customers arrive at the same question once they locate the testing report: what exactly am I looking at?
The answer is usually a Certificate of Analysis, commonly referred to as a COA. At first glance, most COAs appear highly technical. They contain laboratory terminology, numerical measurements, chemical names, and testing data that can feel overwhelming to someone seeing the document for the first time. The good news is that consumers do not need a scientific background to extract meaningful information from these reports. In most cases, a few key sections tell customers almost everything they need to know.
Throughout our content hub, we have emphasized the importance of transparency. A COA is one of the most practical tools consumers have for moving beyond marketing claims and evaluating objective information about a product.
What Is a Certificate of Analysis?
A Certificate of Analysis is a laboratory report generated by an independent testing facility. Its purpose is to verify information about a product and provide consumers with data that exists outside of the manufacturer’s marketing materials.
Think of a COA as a verification document. A manufacturer can make numerous claims regarding potency, ingredients, and quality, but an independent laboratory provides a second layer of information that helps consumers evaluate those claims more critically. While a COA does not answer every question about a product, it provides a useful starting point for informed decision-making.
In many respects, a COA serves a similar purpose to a vehicle history report when purchasing a used car or a home inspection before buying a house. It offers information that helps consumers look beyond appearances and make better-informed decisions.
The First Thing I Look For
When reviewing a COA, the first thing I look for has nothing to do with cannabinoids, potency, or laboratory measurements. I simply want to confirm that the report actually belongs to the product I am evaluating.
Most reports include information such as:
Product name
Batch number
Lot number
Date tested
Date reported
These details matter because laboratory reports are only useful when they correspond to the product being purchased. A COA should clearly identify the specific product and batch that was tested. If that connection cannot be established, the report becomes far less valuable.
I also pay attention to how easy the company makes the report to find. Reputable manufacturers typically want customers to review their testing information. Many place QR codes directly on packaging or make reports readily available through their websites. While accessibility alone does not guarantee quality, transparency often begins with a willingness to share information.
A Real-World Example of a Typical COA
Although laboratory formats vary, most Certificates of Analysis contain similar categories of information. The exact numbers may change from product to product, but the sections themselves are often remarkably consistent.
Imagine a customer scans a QR code and sees something similar to the example below.
Product Identification
This section simply confirms that the report corresponds to the product being purchased.
Cannabinoid Profile
This is usually the section customers notice first because the cannabinoid names are familiar. The purpose of this section is not to identify the biggest number on the page. Instead, consumers should use it to determine whether the laboratory findings generally support the claims made by the manufacturer.
If a package advertises THCP, the report should demonstrate measurable THCP content. If a company highlights additional cannabinoids, those should appear as well.
The key question is not whether the numbers are large. The key question is whether the report appears consistent with the product being marketed.
Understanding Potency Measurements
Many laboratories also provide summary calculations such as:
Total Cannabinoids
Total Active Ingredients
Total THC
Customers often gravitate toward these figures because they simplify comparison. While these measurements can be useful, they should not become the sole basis for a purchasing decision.
One lesson I learned during my years in consumer products is that consumers frequently overvalue the easiest metric to compare. Potency matters, but product quality, formulation, ingredient sourcing, consistency, and manufacturing standards matter as well. The most informed consumers view potency as one piece of a much larger picture.
Terpene Analysis
Some COAs include terpene testing, particularly for flower products, concentrates, and certain vape products.
A terpene section may look something like this:
Consumers do not need to memorize these names. What matters is understanding that terpenes contribute to a product’s aroma and overall profile. Customers often focus exclusively on cannabinoid content while overlooking terpene information that may provide additional insight into the product.
This is one reason we devoted an entire article to terpene profiles earlier in our content hub.
Heavy Metal Testing
If there is one section consumers overlook more than any other, it is heavy metal testing.
Most laboratories screen for substances such as:
Lead
Arsenic
Mercury
Cadmium
The report will typically indicate whether the product passed or failed established thresholds.
From a consumer perspective, this is one of the sections that deserves close attention. A product that successfully passes heavy metal screening demonstrates that the manufacturer submitted the product for meaningful safety-related testing rather than focusing solely on potency.
Pesticide Screening
Many laboratories also evaluate products for agricultural chemicals and pesticide residues.
The list can be extensive and may include dozens of compounds with names unfamiliar to most consumers. Fortunately, customers do not need to understand every chemical being tested.
The important question is whether the product passed the screening process. The presence of comprehensive pesticide testing often reflects a manufacturer’s commitment to transparency and quality control.
Residual Solvent Testing
For products such as vapes, concentrates, extracts, and infused formulations, laboratories frequently test for residual solvents.
Examples may include:
Butane
Propane
Ethanol
Hexane
Again, the objective is not for consumers to become chemists. Instead, consumers should simply verify that the product passed testing and that the manufacturer appears willing to provide that information openly.
Microbial Testing
Many COAs also include microbial screening.
Testing may involve organisms such as:
Salmonella
E. coli
Yeast
Mold
Results are typically presented as either “Pass,” “Not Detected,” or a similar designation.
This section helps provide confidence that the product was evaluated for common biological contaminants before reaching consumers.
What Matters Most?
If a customer handed me a COA and asked what I review first, my checklist would be relatively simple:
Does the report match the product?
Was the product tested recently?
Does the cannabinoid profile support the marketing claims?
Did the product pass heavy metal screening?
Did it pass pesticide screening?
Did it pass microbial testing?
Does the company make this information easy to access?
Ironically, the final question may be one of the most revealing. Companies that willingly share testing information are demonstrating a level of transparency that consumers should appreciate. While transparency does not automatically guarantee quality, a lack of transparency should always encourage additional questions.
Final Thoughts
Certificates of Analysis may appear intimidating at first, but their purpose is surprisingly simple. They exist to provide transparency and help consumers verify information independently.
The goal is not to become a laboratory expert. The goal is to understand enough to recognize whether a company appears committed to transparency, whether the report supports the claims being made, and whether the product successfully passed the types of testing consumers should expect from reputable manufacturers.
At North Georgia Smoke Shop, we believe informed customers make better decisions. Learning how to read a COA is one of the most practical skills consumers can develop in today’s hemp-derived marketplace.
Frequently Asked Questions
What is a COA?
A Certificate of Analysis is an independent laboratory report that provides information about a product’s contents and testing results.
What should I check first?
Start by verifying that the report matches the product you are purchasing and that the testing information appears current.
Is potency the most important part of a COA?
Not necessarily. Potency is one factor, but consumers should also review heavy metal screening, pesticide testing, microbial testing, and overall transparency.
Why do reputable companies provide COAs?
COAs allow consumers to verify information independently and demonstrate a manufacturer’s commitment to transparency.
If you have questions about Certificates of Analysis, cannabinoids, product testing, or how to evaluate products more effectively, stop by North Georgia Smoke Shop in East Ellijay. We are always happy to answer questions and help customers make informed purchasing decisions.
Disclaimer
The information contained in this article is intended for educational purposes only and should not be considered medical advice. Products discussed have not been evaluated by the Food and Drug Administration and are not intended to diagnose, treat, cure, or prevent any disease. Always research products carefully and purchase from reputable sources.
Author Bio
David Sayyed is co-owner of North Georgia Smoke Shop in East Ellijay, Georgia. Before becoming an entrepreneur and owner-operator, David spent more than two decades in product marketing, e-commerce, brand management, and P&L leadership roles with multiple Fortune 500 companies, including Amazon, Procter & Gamble, Coca-Cola, Georgia-Pacific, Nestlé Purina, and Kaspien. Today, he combines that experience with a hands-on retail perspective, helping customers navigate an increasingly complex marketplace through education, transparency, and straightforward advice.
