How to Read a COA (Certificate of Analysis)
Every legal cannabis product sold in Oklahoma comes with a Certificate of Analysis, or COA. It's the lab report that tells you what's actually in your product — how potent it is, what terpenes it contains, and whether it passed safety testing. Once you know how to read one, you'll never look at a label the same way again.
What a COA is and why it exists
A COA is an official report issued by a licensed, independent testing laboratory. In Oklahoma, growers and processors are legally required to send samples from every batch to an OMMA-licensed lab before that product can be transferred to a dispensary and sold. Those labs have to be accredited to the ISO/IEC 17025 standard, which is the international benchmark for testing competence.
The results get reported into Metrc, the state's seed-to-sale tracking system, and the COA travels with the product. The point is simple: it protects you. A COA verifies that what's on the label is accurate and that the product was screened for things you don't want to consume.
How to find the COA for your product
Most Oklahoma product labels include a QR code or batch number linked to the COA. Scan the code, or ask your dispensary — any licensed dispensary should be able to provide the lab report for a product on request. Match the batch number on the COA to the batch number on your product. If they don't match, the report isn't for what's in your hand.
The sections of a COA, explained
A COA can look intimidating at first — lots of numbers, abbreviations, and units. Here's what each part is telling you.
1. Header and batch information
The top of the report identifies the testing lab, the product, the client (grower or processor), the batch or lot number, sample dates, and often the lab's license and accreditation details. This is your reference information. Confirm the product name and batch match your purchase, and check the test date — terpene content in particular can shift as a product ages.
2. Cannabinoid potency
This is the section most people look for. It lists the concentrations of cannabinoids, usually as a percentage of weight (for flower) or in milligrams (for edibles and other products). You'll commonly see:
- THCA — Tetrahydrocannabinolic acid, the raw, non-intoxicating form found in fresh flower
- Delta-9 THC — The active intoxicating cannabinoid
- CBD and CBDA — Cannabidiol and its acidic form, non-intoxicating
- CBG, CBN, CBC — Minor cannabinoids that may contribute to the overall profile
A key point about Total THC: raw flower contains mostly THCA, not active THC. THCA only converts to THC when it is heated (smoking, vaping, or cooking) — a process called decarboxylation. Labs calculate Total THC using the formula: Total THC = (THCA x 0.877) + Delta-9 THC. The 0.877 accounts for weight lost during conversion. This is why a flower listing 24% THCA does not simply add up to 24% active THC — and why comparing raw THCA to a finished product's THC is not apples to apples.
3. Terpene profile
This section lists the aromatic compounds that shape the product's smell, flavor, and character. You'll see terpenes like myrcene, limonene, caryophyllene, pinene, and linalool, each with a measured concentration. Many experienced shoppers find the terpene profile a more useful guide to the experience than the THC number alone. The dominant terpenes tell you a lot about what to expect.
4. Safety and contaminant testing
This is the part that quietly does the most important work. Oklahoma requires products to be screened across a range of safety categories, and the COA shows a result — typically Pass or Fail — for each. Required testing in Oklahoma covers:
| Screen | What it confirms |
|---|---|
| Pesticides | No banned or excessive agricultural chemical residues. A failure here cannot be remediated — the batch must be destroyed. |
| Residual solvents | Leftover chemicals from concentrate extraction are below action limits (relevant especially for vapes and concentrates). |
| Heavy metals | Lead, arsenic, cadmium, and mercury are within safe limits. |
| Microbials | No harmful bacteria or other microorganisms. |
| Mycotoxins | No toxic compounds produced by certain molds. |
| Foreign material and filth | No physical contaminants. |
| Water activity and moisture content | In range — too high invites mold growth, too low degrades quality. |
What a good COA looks like
When you're reviewing a report, a few things signal you're holding accurate, trustworthy information:
- The batch number matches your product
- The lab is named and accredited, and the report is recent
- Every safety and contaminant category shows a passing result
- The cannabinoid and terpene values are filled in — not blank or marked "not tested"
Red flags
Be cautious if a COA is missing entirely, can't be matched to a batch, comes from an unnamed or unaccredited lab, shows failed or skipped safety tests, or makes potency claims that don't appear on the actual report. In a legal Oklahoma dispensary these should be rare — but knowing what to look for is exactly how you keep it that way.
Verify any batch
Every Golden Bloom batch links to its COA — cannabinoids, full terpene profile, and the complete safety panel, straight from the lab.
Browse strainsThe bottom line
A COA turns a label's claims into verified facts. It confirms potency, reveals the terpene profile, and — most importantly — proves the product was screened for contaminants by an independent, accredited lab. Taking thirty seconds to scan and read one is one of the simplest habits a smart, safety-conscious patient can build.