How to Read a Certificate of Analysis (COA) Like a Pro

A COA is the most useful document a hemp brand can give you, if you know what to look for beyond the potency number. Here's how to actually read one.
By Miiintz
2 min read

A Certificate of Analysis is the single most useful document a hemp flower brand can hand you, and also one of the most skimmed-past. Most shoppers glance at the potency number and move on. Learning to read the rest of it takes a few minutes and tells you far more about what you're actually buying.

Match the Batch Number First

Before looking at any results, confirm the COA belongs to the product in front of you. Hemp flower is tested batch by batch, since potency and contaminant levels can vary from one harvest to the next. Every legitimate COA lists a batch or lot number, and that number should match what's printed on your packaging. A COA with no batch number, or one that's clearly generic across an entire product line, isn't telling you anything about the specific flower in your jar.

Read the Potency Panel Correctly

The potency section will list multiple cannabinoids, not just one number. For THCA flower, look for both the THCA percentage and the Delta-9 THC percentage listed separately — the Delta-9 figure is what determines federal hemp compliance (0.3% or under, dry weight), while the THCA figure tells you what the flower converts to once heated. Some COAs also calculate a "total THC" figure, a formula that estimates the THC yield after full decarboxylation. Understanding which number is which keeps you from misreading a high THCA percentage as somehow non-compliant.

Check the Safety Panels, Not Just Potency

A complete COA goes beyond cannabinoids. Look for a pesticide panel (results should read "ND," for not detected, or "pass," across the tested compounds), a heavy metals screen (checking for lead, arsenic, cadmium, and mercury, since cannabis plants readily absorb metals from soil), and microbial testing (checking for mold, yeast, and bacteria). A COA that only shows potency and nothing else is incomplete — it tells you strength, not safety.

Confirm the Lab Is Independent

Look for the testing lab's name and accreditation on the document, and check that it's a third-party facility rather than an in-house lab operated by the brand itself. Independent testing is what gives a COA its credibility — a lab with no financial stake in the results has no particular reason to round numbers in a seller's favor.

Red Flags Worth Knowing

Be cautious of COAs that are undated, missing a lab name entirely, show results with no pass/fail or ND thresholds listed, or that you can't find posted anywhere accessible on the seller's site. A brand confident in its testing makes the COA easy to find, not something you have to request.

Every batch of Miiintz flower ships with its own third-party COA covering potency, pesticides, and heavy metals, posted for the specific batch you're holding — not a stock document recycled across the catalog.