1. Match the product and batch
Compare the product name and batch or lot number on the report with the package. Check whether the sample was the finished product. A report for a different batch or a raw ingredient leaves a gap.
2. Identify the laboratory and date
Look for a named laboratory, report identifier, test date, and methods. Prefer a report you can verify with the lab. Accreditation should be relevant to the method and material tested; a logo alone does not explain the scope.
3. Read the units
CBD may be expressed in mg/g, mg/mL, percentage, or milligrams per unit. Do not compare numbers until the units and sample basis match. “Not detected” means below a method’s detection limit; it is not a universal promise of absolute zero.
4. Check what else was tested
A potency panel is not the same as testing for pesticides, heavy metals, residual solvents, or microbial contamination. Look for results and reporting limits rather than simply counting “pass” badges. The FSA’s analysis of retail CBD products shows the range of measurements involved. [1]
5. Know the report’s limits
A report describes the submitted sample and the requested tests. It cannot establish clinical effectiveness, predict a drug test, or decide suitability for an individual. Save a copy and ask the seller to explain missing information before relying on the label.
When two CBD numbers are actually comparable
The following numbers are hypothetical reading examples. They show the information needed for a comparison, not tested products or suggested servings.
| Label and report | Valid comparison | Missing information |
|---|---|---|
| 600 mg in 30 mL; report 20 mg/mL | 600 ÷ 30 = 20 mg/mL: the numbers agree on that basis. | Whether the report matches this finished-product batch. |
| 600 mg in 30 mL; report 20 mg/g | Mass and volume units cannot be equated. | Product mass or a documented density conversion. |
| THC marked ND | Read ND with the method’s stated limit. | The limit, units and exact cannabinoid measured. |
| Potency results marked pass | This addresses the listed potency test. | Separate contaminant panels and their results. |
The newer FSA survey tested 100 products bought in England and Wales during 2022–23. It reported 49 matching their CBD claim, eight above and 43 below. This is a defined historical sample, not a current failure rate for every retailer.
In the first hypothetical row, the arithmetic matches, but that alone leaves batch identity unanswered. In the second, doing the same division does not repair the change from millilitres to grams. Ask for the missing basis instead of rounding until the numbers look close. The NIST comparison program addresses measurement comparability between laboratories; a laboratory logo is therefore the start of verification rather than a substitute for method details. Read the panel headings as a list of questions actually tested. A blank pesticide panel provides no pesticide result, however accurate the CBD measurement may be.
A label claim and a measurement can differ
View the full-size chart ↗FSA/Fera tested 100 selected products purchased in England and Wales between October 2022 and March 2023. The executive summary reports 49 matching CBD claims, eight above and 43 below.
This was a tailored sampling study. These counts describe those products and dates, rather than the prevalence of mislabelling in the current global market.
FSA / Fera · Analysis of CBD Products (2022–23) ↗A report comparison that can be checked
- Same batch
Finished product and package identifiers agree.
- Same basis
Units and sample basis are compatible.
- Named panels
List tested questions and unresolved ones.
Save the report and annotate its batch, units and missing panels before asking the seller one specific question.
Scope: The example calculations do not verify a product. The FSA survey used a particular historical sampling plan.
Questions worth asking
Does ND mean absolutely no THC?
No. It means the reported result is below a method-specific detection or reporting limit; read the report’s definition and units.
Can a potency pass replace contaminant testing?
No. The potency result does not supply results for tests that were not performed or reported.
Sources & scope
- Food Standards Agency · Analysis of CBD products (2022–23)
- FDA · CBD: risks, side effects and unknowns
- FSA · Product analysis, 2022–23 survey
- NIST · Cannabis laboratory comparison, 2024
Sources checked October 19, 2026. Linked material supports the specific claims discussed; practical label checklists are editorial guidance. This article has not received clinical or veterinary peer review. Read our editorial approach.
Educational information for adults. Not a diagnosis, treatment plan, product endorsement, or personal dosing recommendation. Ask a qualified clinician or veterinarian about your situation.
