In detail
The LOQ is established during method validation and depends on the instrument, sample preparation, and matrix. A pesticide result reported as '<0.01 mg/kg' means the laboratory could not quantify below that level; it does not mean the residue is absent. If the regulatory limit is 0.02 mg/kg, the margin matters.
When comparing certificates, compare the LOQ as well as the result. A supplier reporting 'not detected' with no LOQ is giving you less information than one reporting '<0.01 mg/kg'. For high-risk markets or botanicals, ask whether the LOQ is below the relevant MRL.
Why it matters to a buyer
- A passing result is only meaningful if the method could detect a failure.
- Different laboratories use different LOQs for the same analyte.
- It affects how you interpret pesticide, solvent, and heavy-metal results.
What to ask a supplier
What is the LOQ for each reported parameter?
Is the LOQ below the regulatory limit for our destination?
How was the LOQ validated for this matrix?
Cite this page
Rainwood Botanical. "Limit of quantification." Botanical extract glossary, October 2026. https://ingredients.rainwoodbio.com/resources/glossary/loq/