Hemp & Cannabinoid Science / Reading a Certificate of Analysis

Reading a Certificate of Analysis

What a COA is and is not, the total-THC decarboxylation arithmetic done properly, what each analytical panel does and does not cover, and a red-flag checklist.

4 pages · 16 citations (10 without a resolved identifier, marked on the page) · updated 2026-09-27

What this section is, and what it is not

Education and harm reduction. Not medical, legal or financial advice. Every factual claim carries a source; contested and single-source claims are marked as such on the page.

The boundary. This section teaches separation, purification, formulation, dosing arithmetic and analytical chemistry with real parameters, because withholding that detail from someone who will proceed anyway is the harm this library exists to prevent. It does not publish preparative routes for converting one cannabinoid into a more intoxicating one; those are described structurally and cited to the literature, without procedures.

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What a Certificate of Analysis Is, and What It Is Not

A COA is a report about one sample at one moment, issued under a defined scope of accreditation, by a defined method, with defined limits. Everything it is commonly assumed to prove that it does not prove.

9 sections · tool

Total THC: The Decarboxylation Arithmetic, Shown

Total THC equals delta-9-THC plus 0.877 times THCA. Where 0.877 comes from, why it is a theoretical ceiling rather than a delivered dose, the same factor for CBD and CBDA, and the unit conversions the hemp industry actually needs.

11 sections · tool

The Panels: What Each One Covers, and What It Does Not

Potency, terpenes, residual solvents, heavy metals, pesticides, mycotoxins, microbials, water activity and moisture — each panel's blind spot, plus why a non-detect is a statement about a method and an unidentified peak is the most important thing on a converted-cannabinoid report.

10 sections · tool

Red Flags: A Practical COA Checklist

Fourteen checks a buyer, retailer or formulator can run on a certificate of analysis without a chemistry background, with what each one means and what to do about it.

5 sections · safety

Absence is not safety. A substance or a pair that is not in this section was not checked and is not thereby safe. This is a curated mechanism reference built from primary literature and regulatory reference works — not a comprehensive interaction database, and not a substitute for a clinician or a pharmacist.