How to Read a CBD Certificate of Analysis (COA)

A step-by-step checklist for reading a cannabinoid lab report: batch match, potency, THC, contaminants, laboratory details and red flags.

Reviewed for accuracy: August 23, 2026 • No firsthand-use claims

1. Match the batch

Find the lot or batch number on the product and confirm that the COA corresponds to it. A generic lab report for a different batch is less useful for the bottle in your hand.

2. Compare cannabinoids

Look for measured CBD, CBN, CBG and THC values and compare them with the label. Pay attention to units: mg/g, mg/mL and percent are not interchangeable without context.

3. Look for contaminant panels

Where provided, review testing for categories such as heavy metals, pesticides, residual solvents and microbes. A cannabinoid potency panel alone is not the same thing as a broad contaminant panel.

4. Identify the laboratory

The COA should identify the lab, sample, test date and methods or panels. Third-party testing is most useful when the report is traceable and batch-specific.

Red flags

• No batch match.
• No test date.
• Only a screenshot with no laboratory identity.
• Potency values that are difficult to reconcile with the label.
• A seller that makes broad medical promises that the report cannot establish.