The document that decides everything, line by line
One document separates a verifiable product from an assertion. It is a laboratory report tied to a batch number, and almost everything else on a product page is either derived from it or unverifiable without it.
Most buyers never see one. Of those who do, most look at a single line — the headline percentage — and stop there. The lines that would actually distinguish two products from each other are further down, and they are frequently absent altogether.
This page walks through the report line by line: what each measurement means, what an absent line implies, which two numbers you have to calculate yourself, and how to tell a document that describes your product from one that describes something else.
⚠️ Scope. This page describes a process and what can be verified from documents. It does not describe what a product does to a person, gives no amounts, and does not replace a healthcare professional.
🔴 What the document is
Its function
It records what a laboratory measured in a specific sample, on a specific date, using a specific method. Nothing more and nothing less.
What it is not
It is not a quality rating, not an approval, and not a guarantee about anything the product does. It is a measurement record.
Who produces it
A testing laboratory, ideally accredited to ISO/IEC 17025 for the methods used. Accreditation is what separates an opposable result from an internal check.
Who pays for it
The producer or the seller. This matters, because it explains why some analyses get commissioned and others do not.
The header
The batch number
The single most important field. It must match the number printed on the packaging you received. If it does not, the document describes a different production run.
The date of analysis
A report has an age. On a material that changes with time, a document from two years ago no longer describes what is in the jar.
The laboratory
Name, address, accreditation reference. A report without an identifiable laboratory cannot be checked against anything.
The sample description
What was submitted: flower, oil, extract, and its mass. A mismatch between this and the product you bought is a straightforward problem.
Cannabinoid content
The layout
A table listing each cannabinoid, usually as a mass percentage and sometimes also in milligrams per gram. One percent equals ten milligrams per gram.
Acid and neutral forms
CBDA and CBD, THCA and delta-9-THC, CBGA and CBG. The acid form is what the living plant contains; heat and time convert it to the neutral form.
Why both are listed
Because they are different molecules with different masses. Adding them without conversion produces a number that means nothing.
What the totals column shows
Some reports add a calculated total. Check which convention it uses before comparing it to another report’s total.
🔴 The one calculation you must do
Total THC
Delta-9-THC plus THCA multiplied by 0.877. That factor comes from the difference in molar mass between the two forms.
Why the multiplication
THCA loses a carboxyl group under heat and becomes THC. The regulatory limit applies to what the material can yield, not only to what it currently holds.
The common error
Reading the delta-9 line alone. On raw flower that figure is often very low while the total is substantially higher.
What to do with the result
Compare it against the limit applicable in the country of delivery. That limit is not identical across the Union.
The limit of quantification
What LQ or LOQ means
Below this threshold the method cannot produce a reliable number. The laboratory writes LQ, ND, or a less-than symbol instead of a figure.
What it does not mean
It does not mean zero. It means not measurable by this method at this threshold, which is a different statement entirely.
Why the distinction matters
A product marketed as containing none of a substance may simply have a value below the reporting threshold. The two claims are not equivalent.
Where to find the threshold
A complete report states it, usually in a footnote or in the method section. Its absence is itself worth noting.
The terpene profile
What it covers
The volatile compounds responsible for aroma, measured by gas chromatography. This is a separate analysis from the cannabinoid panel.
Why it is often missing
Nothing requires it, and it costs money. A producer who commissions it is spending on information nobody obliges them to provide.
How to read it
Look at the three highest compounds by proportion rather than the total. Those three describe the aroma far better than the sum does.
What it cannot tell you
Nothing about potency, purity or compliance. It describes composition on one axis only.
Residual solvents
When the line applies
On any product made using a solvent extraction. On mechanically separated material or raw flower it is less relevant, though some laboratories still report it.
What is measured
Traces of the solvents used in processing, against thresholds derived from established guidance on residual solvents in pharmaceutical products.
Why it matters more on concentrates
Concentration multiplies everything, including what should not be there. The same line carries more weight on an extract than on a flower.
What an absent line means
That the analysis was not commissioned. On a solvent-extracted product, that absence is a substantive gap rather than a formality.
Pesticides
The scope
A panel of active substances, tested against maximum residue levels. The size of the panel varies enormously between laboratories.
Reading it properly
Check how many substances were screened, not just whether the result says pass. A ten-substance panel and a two-hundred-substance panel are not comparable.
The cost factor
It is one of the more expensive analyses. Its presence on a report is a reasonable proxy for how seriously a producer approaches verification.
What a pass means
That nothing in the tested panel exceeded its threshold. It says nothing about substances outside the panel.
Heavy metals
Why they are tested
The plant takes up metals from soil and water. Cadmium, lead, mercury and arsenic are the four usually screened.
What determines the result
Soil composition and irrigation water, more than anything the producer does after harvest. It is the one line that reflects the growing site.
The regulatory reference
Maximum levels for contaminants in food are set at Union level and apply to products falling within that framework.
The concentrate problem
Extraction concentrates metals along with everything else. A flower result and an extract result are not directly comparable.
Microbiological results
What is screened
Total viable count, yeasts and moulds, and specified pathogens depending on the panel and the product category.
Why it matters
It is the only line on the report that speaks to whether the material is safe to handle at all, as distinct from what it contains.
The regulatory framework
Microbiological criteria for foodstuffs are set at Union level and provide the reference thresholds where the product falls within scope.
Its relationship to drying
Contamination almost always originates in a drying or storage failure. A clean microbiological result is indirect evidence of a controlled process.
Water content
Where it appears
Not on every report. When present it is usually expressed as a percentage of mass.
Why it is reported
Because all other figures are expressed on a dry basis. Water content is what makes that normalisation possible.
What it tells a buyer
Whether the weight purchased is material or moisture. A high figure means paying for water.
The storage connection
It also indicates whether the material sits inside the range where microbiological risk stays low.
The method section
What it should state
The analytical technique used for each panel, the limits of quantification, and the reference method where one applies.
Why it matters
Two laboratories using different methods can produce different numbers for the same sample. Without the method, discrepancies cannot be interpreted.
Chromatography in brief
Liquid chromatography for cannabinoids, gas chromatography for terpenes and solvents, mass spectrometry for trace contaminants.
The accreditation link
ISO/IEC 17025 accreditation is granted per method, not to the laboratory as a whole. A laboratory can be accredited for one panel and not another.
The signature and identifiers
What should be there
An authorised signature or electronic equivalent, a unique report reference, and the page numbering of a multi-page document.
Why the reference matters
It allows the report to be verified with the issuing laboratory. Some laboratories offer online lookup by reference.
Missing pages
Reports are frequently circulated as a single page extracted from a longer document. The page count tells you whether you are seeing all of it.
The screenshot problem
An image of a report cannot be checked against the laboratory. A PDF with metadata is a different kind of evidence.
What a general report does not cover
The product line document
Some sellers publish one report for an entire product line. It describes a batch that is not the one you received.
Why the distinction is not pedantic
Batches differ in exactly the ways a report is supposed to record. A document that does not match your batch number provides no information about your product.
The correct request
Ask for the certificate corresponding to the batch number printed on the packaging. That phrasing leaves no room for substitution.
What a refusal signals
A seller who cannot produce the document for a batch they are selling has answered the most important question about themselves.
Reading two reports side by side
The comparison that works
Same producer, same variety, consecutive batches. This isolates process consistency from every other variable.
What consistency indicates
A producer whose figures stay close across batches controls their process. Wide swings indicate otherwise.
The comparison that does not work
Two different producers, different varieties, different laboratories. Too many variables move at once for any conclusion to hold.
What to record
Batch number, date, headline figures and total THC. Four fields per purchase build a usable history within months.
Turning the report into a price
The calculation
Total milligrams of the compound of interest, divided into the price paid. The result is euros per milligram.
Getting to milligrams
Percentage multiplied by mass in grams multiplied by ten. Five grams at eight per cent gives four thousand milligrams.
Why this ranks offers
It removes format, pack size and presentation from the comparison and leaves one number that means the same thing everywhere.
Its limitation
It compares on one axis. A cheaper product with a thinner analytical panel is not straightforwardly better value.
Claims and what the report cannot support
The regulatory position
The EU Register of nutrition and health claims contains no authorised entry for cannabidiol to this day. That absence functions as a prohibition.
What this means for a report
No line on any certificate supports a statement about what a product does for a person. The document measures composition.
The common misuse
A high percentage presented as evidence of a benefit. The percentage is a fact; the inference is not permitted.
What can properly be said
The composition, the method, the date, the batch. Everything a report contains, and nothing beyond it.
Where reports are published
On the product page
The best practice: a direct link on each listing, to the document for the batch currently shipping.
By batch number lookup
Some sellers maintain a searchable archive. This is the most useful arrangement and the least common.
On request
Still acceptable, provided the request is answered promptly and with the correct batch. A delay of weeks is an answer in itself.
Not at all
More common than it should be. Where no document exists, the headline percentage is an unverified assertion.
Common misreadings
Total cannabinoids as potency
That figure sums different molecules. It flatters the product and answers a question nobody asked.
Comparing across matrices
A percentage on flower and a percentage on oil describe different things. Convert both to milligrams before comparing.
Ignoring the date
A report from before a long storage period describes a state the product has since left.
Reading a pass as complete
A pass on a narrow panel is a narrow statement. The scope of what was tested matters as much as the result.
What the report costs a producer
Per batch
A full panel across cannabinoids, contaminants and microbiology represents a real recurring expense, particularly for a small operation.
The temptation
Testing annually rather than per batch, and reusing the document. This is precisely what checking the batch number detects.
What this explains
Why thorough reports correlate with higher prices. It is one of the few price differences in this sector with an identifiable cause.
The buyer’s leverage
Asking for the batch document, every time, is what makes per-batch testing commercially worthwhile for the producer.
What sampling does to the number
How the sample is taken
A portion is drawn from the batch and submitted for analysis. The result describes that portion, and its relationship to the rest of the batch depends entirely on how representative the draw was.
Where it goes wrong
On a batch that mixes bud sizes or material from different parts of the plant, a single grab sample can differ measurably from what ends up in any given package.
What a good procedure looks like
Multiple increments taken from different points in the batch, combined and homogenised before subsampling. Accredited laboratories work to a defined sampling procedure.
What the buyer can infer
Very little directly, but a producer who describes their sampling procedure when asked is telling you something about how the rest of the operation runs.
Two reports that disagree
Why it happens
Different laboratories, different methods, different limits of quantification, different sample portions. Any of these produces a gap without either result being wrong.
The size of a normal gap
Analytical variation of a few per cent relative is ordinary. A gap of tens of per cent points to something other than measurement noise.
How to investigate
Compare the method sections first, then the sampling dates, then the batch numbers. In most cases the explanation appears in one of those three.
When it matters commercially
If an independent test shows content materially below the declared figure, the report and the packaging together support a conformity complaint under consumer law.
A short glossary
Batch
A quantity of product from a single production run, identified by a number and tied to one analytical report.
Total THC
Delta-9-THC plus THCA multiplied by 0.877. The sum to which regulatory limits apply.
Limit of quantification
The threshold below which a method cannot produce a reliable figure. Reported as LQ or ND, meaning not measurable rather than absent.
ISO/IEC 17025
The standard setting competence requirements for testing laboratories. Accreditation is granted per method.
Dry basis
The convention of expressing content relative to the mass of the material with water excluded, so that moisture does not distort comparison.
The five checks that apply to any product
The batch certificate
Request it with the number printed on the packaging. A general document for the product line does not cover this batch, and those differences are exactly what it should record.
Total THC
Delta-9-THC plus THCA multiplied by 0.877, because THCA becomes THC under heat and the limit applies to the sum, not to either value alone.
Price per milligram
A division, not an opinion. The only figure that makes two products comparable, whatever the format, process and pack size.
The claims
Without an authorisation number in the EU Register these are assertions, not data — and for cannabidiol that register contains no authorised entry to this day.
The seller’s details
Company name, address and contact. Without them there is also no counterparty to turn to if something turns out to be wrong.
How this connects to the rest
With price per milligram
The report supplies the number the calculation needs. Without it, the division rests on an unverified claim.
With storage
The water content and microbiological lines describe the state at sampling. What happens afterwards is the buyer’s responsibility.
With consumer rights
A measured content materially below what was advertised is a conformity defect, and the report is the evidence.
With batch variation
The document is the only place where differences between production runs are recorded at all.
What this is for in practice
Before buying
Ask for the batch certificate. The answer, and how quickly it arrives, decides more than the document itself.
On arrival
Check the batch number on the packaging against the number on the report. It takes seconds and it is skipped almost always.
When comparing
Convert to milligrams, divide by price, then compare the analytical panels. In that order.
When something is wrong
The report, the invoice and the packaging together form a complete file. Keep all three.
Frequently asked questions
What is a certificate of analysis? A laboratory record of what was measured in a specific sample from a specific batch, on a stated date using stated methods.
Which line matters most? The batch number, because it determines whether the document describes your product at all.
How do I calculate total THC? Delta-9-THC plus THCA multiplied by 0.877. The factor accounts for the mass difference between the two forms.
What does LQ mean? Below the limit of quantification: not measurable by that method at that threshold. It does not mean zero.
Why are acid and neutral forms listed separately? They are different molecules with different masses. Heat and time convert one to the other.
Is a terpene profile always included? No. It is a separate analysis that nothing requires, and it is commissioned less often than the cannabinoid panel.
What if the report has no batch number? Then it cannot be tied to the product you received, and it provides no verifiable information about it.
Does a pesticide pass cover everything? Only the substances in the panel tested. Check how many were screened, not just the verdict.
How recent should a report be? Close enough to the production date that the material has not materially changed. A gap of years is a gap in the record.
Does the report say anything about benefits? No. It measures composition. The EU Register contains no authorised claim for cannabidiol.
What we check and what we do not
We check what can be checked from documents: official registers, declared contents, certificates of analysis, arithmetic. We test no products, rank nothing, and assert no effects.
This document is the only point in the whole chain where a measurement is written down and attached to a specific quantity of material. Everything upstream of it — the growing, the drying, the curing, the trimming — leaves no record at all. Everything downstream depends on it.
That makes reading it properly the single highest-return skill available to a buyer in this sector. It takes about two minutes per report once the layout is familiar, and it replaces every marketing claim on the page with either a number or a gap.