How to Read a Hemp COA: The Complete Guide
Published May 4, 2026
The Quick Answer
A hemp COA (Certificate of Analysis) is a third-party lab report showing exactly what's in the flower or extract you're buying. Look for five key sections: total cannabinoids, terpene profile, Delta-9 THC (must be under 0.3%), residual solvents and pesticides (should read 'not detected'), and heavy metals and microbial contaminants. If a brand can't show you the COA, don't buy from them.
What a COA Actually Is
A Certificate of Analysis is a lab report from a third-party accredited testing facility (ideally ISO/IEC 17025 accredited). It documents the specific cannabinoid content, terpene profile, and safety screens for a specific batch of product. Every batch should have its own COA — one COA for the whole company is meaningless.
The 5 Sections You Actually Need to Understand
1. Cannabinoid Profile
Shows the percentage of each cannabinoid: THCA, THC, CBD, CBG, CBN, and others. For hemp compliance, look at Delta-9 THC — must be less than 0.3% by dry weight. THCA percentage tells you the potency after decarboxylation (heat). A high THCA number (20%+) indicates high potency.
2. Terpene Profile
Lists the specific terpenes and their concentrations. Look for total terpene percentage (premium flower typically 2-4%+) and the top 3-5 terpenes by concentration. Myrcene indicates sedation, limonene indicates uplift, pinene indicates focus, linalool indicates calm. This is where the strain-specific effect character comes from.
3. Residual Solvents
For extracts, this section is critical. All solvents (butane, ethanol, propane, etc.) should read 'Not Detected' or below regulatory limits. For live rosin (which uses no solvents), this section is a confirmation of the solventless claim. For distillate and live resin, it verifies the product was properly purged.
4. Pesticides
Screens for over 60 individual pesticides commonly used in indoor and outdoor cultivation. All results should read 'Not Detected'. Any positive result — even 'passing' the state limit — is a red flag for premium consumers who expect clean product.
5. Heavy Metals and Microbials
Screens for arsenic, cadmium, lead, mercury, and microbial contaminants including yeast, mold, salmonella, and E. coli. All should read 'Not Detected' or below regulatory thresholds. Heavy metals can accumulate in cannabis grown in contaminated soil; microbials indicate cure quality issues.
Red Flags on a COA
Missing sections (any of the 5 above), a report older than 12 months (regulations require regular re-testing), a batch number that doesn't match the product you're holding, an accredited-lab name that doesn't check out on ISO databases, or 'trace amounts' of pesticides passed off as acceptable.
How to Actually Look Up a COA
Every reputable hemp brand prints a QR code or lookup code on the packaging. Scan or enter it on the brand's COA portal (TP-G Farm uses labs.topgfarm.shop). The report that loads should match the batch you're holding — same strain, same batch number, same harvest date. If the report shows a different batch, ask why.
Frequently Asked Questions
The most-asked questions on this topic — answered in plain English.
Reading a COA
What is a COA in cannabis?
A COA (Certificate of Analysis) is a third-party lab report documenting exactly what's in a specific batch of hemp flower or extract. It includes cannabinoid percentages, terpene profile, Delta-9 THC (must be under 0.3% for hemp), residual solvents, pesticides, heavy metals, and microbial contaminants. Every batch should have its own COA.
How do I read a hemp flower COA?
Focus on five sections: cannabinoid profile (total THCA + Delta-9 check), terpene profile (top 3-5 terpenes), residual solvents (should be 'Not Detected'), pesticides ('Not Detected'), and heavy metals + microbials ('Not Detected'). If any section is missing or shows positive results, ask questions or walk away.
What should Delta-9 THC be on a hemp COA?
Below 0.3% by dry weight — that's the federal legal limit under the 2018 Farm Bill for hemp. Anything above that isn't hemp anymore; it's marijuana. Most COAs show Delta-9 as a percentage (like 0.14%) or in mg/g. Make sure the number is under 0.3%.
Trust & Compliance
How can I verify a hemp COA is real?
Three checks: (1) the lab should be ISO/IEC 17025 accredited (verifiable on the lab's website), (2) the batch number and product on the COA should match what you're holding, (3) the report date should be within 12 months. If any of the three fail, the COA is either faked or outdated.
Why do some brands not have COAs?
Because they're operating outside compliance. Testing costs money and takes time — brands that skip it are either cutting corners or hiding results. A reputable hemp brand publishes every batch COA, either as a QR code or on their website. Not having a COA is a hard 'no' for premium consumers.
Hemp-derived. Contains less than 0.3% Delta-9 THC. 2018 Farm Bill compliant. Not evaluated by the FDA. Not intended to diagnose, treat, cure, or prevent any disease. Must be 21+. Lab-verified — view COAs at labs.topgfarm.shop.
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