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How to Read a COA (Cannabis Lab Report)
Short answer: match the batch number on the COA to your package, check total THC and CBD, glance at terpenes if listed, and confirm the safety screens (pesticides, heavy metals, microbials, residual solvents) say pass.
Step 1: Confirm it's the right report
A COA (certificate of analysis) is issued for a specific batch. Find the batch or lot number on the COA and compare it with the one on your package. Also check the lab name and test date. A report for a different batch doesn't tell you about your product.
Step 2: Read the cannabinoid section
You'll see rows for THCA, delta-9 THC, CBD, CBDA and often CBG, CBN and others. Flower and concentrates show percentages; edibles and tinctures show milligrams.
Look for total THC. If it isn't listed, calculate it: total THC = THCA × 0.877 + delta-9 THC. Example: 24.0% THCA and 0.6% delta-9 THC gives 24.0 × 0.877 + 0.6 = 21.6% total THC.
For edibles, check mg per serving and per package, and compare them with the label. See milligrams.
Step 3: Check terpenes (if tested)
Some COAs include a terpene panel listing compounds like myrcene, limonene and caryophyllene as percentages. It's a helpful guide to aroma and flavor.
Step 4: Check the safety screens
- Pesticides: tested against a list of chemicals with limits.
- Heavy metals: such as lead, arsenic, cadmium and mercury.
- Microbials and mycotoxins: mold, yeast and bacteria, plus toxins some molds produce.
- Residual solvents: for extracts, solvent left after the purge, usually in parts per million.
- Moisture / water activity: for flower, related to mold risk.
Each section should say pass or show results under the limit.
Step 5: Ask if anything's unclear
Ask our staff to see the COA for a product, or scan the QR code on the package if there is one. We're happy to walk you through it.
Effects vary from person to person. Don't drive after use. Keep out of reach of children and pets. Not for use if pregnant or breastfeeding. Educational only, not medical advice. 21+.