Quality & Lab Testing
Third‑Party Lab Testing for Hemp Products: What “Pass” Should Include
What good testing looks like, why it matters, and how to avoid “COA theater.”
Key takeaways
- Third‑party testing confirms potency and screens for contaminants.
- Look for batch-specific COAs (matching lot numbers).
- Potency-only COAs are incomplete — purity panels matter.
- ISO/IEC 17025 accreditation is a strong signal, but still review what tests were run.
Table of contents
Why testing matters
Hemp can absorb compounds from soil and the growing environment. Testing helps confirm cannabinoid amounts and screens for unwanted contaminants.
New to CBD? CBD 101.
What to look for in lab testing
1) Cannabinoid potency panel
Confirms CBD amount and reports whether THC is present.
Guide: How to Read a CBD COA
2) Purity panels
- Heavy metals
- Pesticides
- Residual solvents (for extracts)
- Microbials
3) Batch specificity
The COA should match the exact lot/batch number. One generic COA for multiple products is a red flag.
What ISO 17025 means (and what it doesn’t)
ISO/IEC 17025 is a standard used to show lab competence and valid results. It’s a good sign — but it doesn’t guarantee every desired panel was run on every batch.
Red flags
- Potency-only COA with no contaminants
- Missing/mismatched batch number
- Very old COAs
- Unclear lab identity or methods
How to use this when shopping (simple workflow)
- Choose spectrum: Isolate vs Broad vs Full
- Verify THC claims: What “THC‑Free” Means
- Read the COA: COA Checklist
- Start low: CBD Dosage for Beginners