How to read a THCA COA (certificate of analysis)

A COA — certificate of analysis — is the third-party lab report that proves what is actually in a product. To read one, work through five things in order: (1) the cannabinoid table (THCA%, delta-9 THC%, and total THC), (2) a batch ID that matches the product, (3) the lab name and test date, (4) the total-THC calculation, and (5) a clear pass on the pesticide, heavy-metal, and residual-solvent panels. If any one of those is missing or does not line up, treat the product as unverified.

1. Read the cannabinoid table

The heart of a COA is the cannabinoid potency table. Each compound is listed separately, usually as a percentage by weight and sometimes in mg per gram. The lines that matter most for a THCA product are THCA, delta-9 THC, and a combined total THC figure. The advertised numbers on the package should match this table — if the front of the jar claims a potency the lab table does not support, believe the lab.

2. Match the batch ID

A COA is only meaningful for the specific batch it tested. Find the batch or lot number on the report and confirm it matches the ID printed on the product you are holding. A COA for a different batch — or a generic “sample” COA with no batch at all — tells you nothing about the jar in your hand.

3. Verify the lab and the date

Check who ran the test and when. A trustworthy COA names an independent, accredited laboratory (not the brand’s own back room) and carries a recent test date tied to that batch. Federal hemp testing expectations — laid out in USDA’s hemp program rules and final rule — lean on accredited, method-validated labs for exactly this reason. An undated or self-issued report is a red flag.

4. Check the total-THC calculation

This is the step most shoppers skip. Raw flower can show a tiny delta-9 number while being packed with THCA — and THCA converts to delta-9 THC when heated, a reaction called decarboxylation. Compliance programs therefore care about total THC, calculated as:

total THC = (THCA × 0.877) + delta-9 THC.

The 0.877 factor reflects the weight a THCA molecule loses during decarboxylation. You can run any COA’s numbers through our free THCA→total THC calculator — paste in the THCA% and delta-9% and see the compliance figure instantly. For more on why this conversion matters legally, see Is THCA legal in Florida?

5. Confirm the safety panels passed

Potency is only half a COA. A complete report also covers pesticides, heavy metals, residual solvents, and usually microbials and mycotoxins. Each panel should show a clear “Pass” against the applicable action limits. A product can be perfectly potent and still fail on contaminants — so do not stop reading once you have found the THC number.

Where THCA comes from in the first place

It helps to remember what the lab is even measuring. THCA is not synthesized by a brand — it is the acidic cannabinoid the cannabis plant naturally produces, abundant in fresh flower and non-intoxicating until heat converts it. The COA simply quantifies how much is present. For the full chemistry, start with What is THCA?

FAQ

What is a COA? A third-party lab report documenting a product’s cannabinoid content and safety testing.

Which line shows the “real” strength? The total-THC line — (THCA × 0.877) + delta-9 — because heating converts THCA to delta-9 THC.

How do I know it is genuine? Matching batch ID, a named accredited lab, a recent date, and a pass on every safety panel.

Want products where the COA always matches the jar? Browse the shop — same-day delivery across Miami, every batch QR-traceable to its lab report.