How to Read a Cannabis Certificate of Analysis (COA) — Complete Guide 2026

The Certificate of Analysis is the most important document in cannabis — the only way to independently verify what is actually in a product. Most consumers have never read one. This guide explains every section.

What Is a COA?

A COA is a document from an accredited third-party laboratory confirming chemical analysis of a specific batch. Responsible brands like West Coast Treez include a QR code on every product linking to the batch-specific COA.

Section 1: Sample Information

Identifies the batch number, sample date, product type and testing laboratory. Verify the lab holds a current state licence — unlicensed lab results are meaningless.

Section 2: Cannabinoid Profile

• THC (Delta-9) — Primary psychoactive cannabinoid, percentage by weight
• THCA — Non-psychoactive acid precursor. Total THC = (THCA × 0.877) + THC
• CBD, CBG, CBN, CBC — Minor cannabinoids contributing to the entourage effect

Section 3: Terpene Profile

Total terpene content above 2% indicates high-quality flower with complex effects. Key terpenes: myrcene, limonene, caryophyllene, pinene, linalool.

Section 4: Safety Panels (Most Critical)

• Pesticides — Any “Fail” is a serious red flag
• Heavy metals — Lead, arsenic, cadmium, mercury must pass
• Residual solvents — Critical for extracts and vapes
• Microbials — Mould, yeast, E. coli, Salmonella screening

View West Coast Treez lab results at https://westcoasttreez.us/lab-results.