Certification vs Laboratory Reports

A laboratory report, an accreditation certificate and a seed certification document may all carry official-looking numbers, signatures and institutional marks. They do not, however, answer the same question. One records the outcome of testing. Another concerns the competence of the organisation performing the work. A third may attest conformity with defined requirements under a specified scheme [1, 2].

That distinction matters wherever biological materials are classified and analysed, including cannabis research. An analytical finding about a submitted sample is not, by itself, evidence of varietal identity or proof that a wider lot meets a certification programme’s rules. Reading a document critically means asking not whether it looks formal, but what it actually establishes.

1. Why “certificate” is not a sufficient description

The vocabulary of conformity assessment can be misleading outside its technical context. A Certificate of Analysis (CoA) normally presents specified analytical findings. A laboratory test report performs a similar reporting function, although the format and required content vary by setting. Neither title automatically signifies independent product certification. Conversely, the phrase “accredited laboratory” describes a recognised scope of competence, not certification of every sample the laboratory handles [1, 2].

ISO describes testing, inspection and certification as distinct conformity-assessment activities. ISO/IEC 17025 sets requirements for competent, impartial and consistent operation of testing and calibration laboratories. ISO/IEC 17065 addresses bodies that certify products, processes or services. Their purposes should not be collapsed into the single word “verified” [1–3].

Four terms, four different questions

Document or framework	What it addresses	What not to infer
Standard or rules	Which requirements or procedures provide the reference?	A standard alone does not show that a particular object was assessed.
Test report / CoA	What was measured or examined, on which identified material?	It does not automatically certify conformity under a separate scheme.
Laboratory accreditation	For which testing or sampling activities has the laboratory’s competence been recognised?	It does not make every test performed by that laboratory accredited.
Certification	Which defined requirements has the identified object been assessed against?	It does not necessarily establish properties outside the scheme.

A useful reading rule is to identify the issuing body, the subject of the assessment and the applicable scope before drawing any conclusion from the title.

2. Testing and certification can support each other without being equivalent

Laboratory measurements often form part of a larger evidence chain. A certification body may use test results among other records in reaching a conformity decision. That does not turn an isolated test report into a certification decision, nor does a certification document necessarily reproduce the full analytical data behind it [1, 3].

Consider two documents describing the same measured characteristic. The first may record a result for material delivered to a laboratory. The second may be issued under a scheme requiring identification of a lot, controlled sampling, defined procedures and documentary links between those stages. Even if the numerical findings are identical, the claims supported by the two documents differ.

The distinction is especially important for a “seed Certificate of Analysis”, a phrase that may appear in informal descriptions. The phrase does not identify one universal international document type. Its evidential meaning depends on the issuing organisation, the test, the sample or lot concerned, and any governing scheme.

3. ISTA Orange and Blue Certificates: the crucial distinction

The International Seed Testing Association (ISTA) provides an unusually clear illustration of why sampling responsibility matters. Its International Rules for Seed Testing address procedures for sampling, testing and reporting, while the organisation’s accreditation system recognises laboratories for specified activities and scopes [4, 5].

Orange International Seed Lot Certificate

An Orange International Seed Lot Certificate relates test results to an identified seed lot through the prescribed ISTA sampling and testing framework. The crucial point is not the colour of the form. It is the documented connection between the lot, the sampling operation and the laboratory examination. Its conclusions are bounded by the analyses reported, the applicable rules and the state of the identified lot when sampled [4, 5].

Blue International Seed Sample Certificate

A Blue International Seed Sample Certificate concerns the submitted sample. The testing laboratory does not assume responsibility for the representativeness of a sample collected outside its control. A Blue Certificate can still accurately report testing carried out on that sample; what it cannot do automatically is establish that the result characterises a larger lot [5].

Reading question	ISTA Orange	ISTA Blue
What is the subject?	An identified seed lot	A submitted sample
How is sampling treated?	Lot sampling is within the applicable ISTA-controlled framework	Sampling before submission is not the testing laboratory’s responsibility
Can the findings be linked to an entire lot?	Within the stated rules and documented sampling conditions	Not merely because the sample was tested
What is the key check?	Do the lot identifier and sampling records match?	Who collected the sample, and what does it represent?
What must not be assumed?	That every untested attribute is certified	That the findings describe a wider lot

Orange should therefore not be described as inherently “better” than Blue. The documents address different evidential questions. Nor should either be presented as a blanket guarantee of genetic identity, varietal purity or every property associated with the material. Those claims require their own documented basis.

4. An ISTA analysis certificate is not the whole of seed certification

Seed certification standards can govern more than the reporting of a laboratory result. The OECD Seed Schemes, for example, are concerned with varietal certification, including rules and procedures for varietal identity and purity in participating systems [6]. ISTA, by contrast, provides internationally standardised methods and certificates of seed analysis. The two functions can complement one another, but their documents must not be treated as interchangeable.

This is also why a reference to an international organisation must be read precisely. The existence of an OECD scheme does not establish that a named sample or cultivar falls within it. Likewise, the fact that a laboratory participates in the ISTA system does not establish that an individual report includes every conceivable test or was issued within every possible accredited scope.

What “purity” refers to

A report may use the word “purity” for physical composition, a measured chemical constituent or varietal identity. These are distinct analytical questions. Varietal purity concerns consistency with a declared variety under the relevant criteria and scheme; it should not be inferred from an unrelated chemical assay [6, 7].

When a document refers to cultivar identification or genetic purity testing, inspect the underlying method. Variety verification may use morphological, biochemical or molecular evidence, depending on the purpose and applicable procedure. ISTA’s Variety Committee explicitly addresses methods for variety verification, including molecular approaches [7]. A cultivar name entered on a submission form is not, without suitable verification, proof of that identity.

Similarly, a single chemical report cannot establish plant genetic stability. Stability is a broader characteristic requiring evidence designed for that particular question. A phytochemical profile and a genetic identity assessment should never be treated as synonymous.

5. Traceability: following the document back to its subject

Traceability is not a decorative assurance attached to an analysis. In practical documentary terms, it is the ability to follow the relevant identifiers and records: the lot or source material, the submitted or sampled unit, the laboratory file and the issued result. Without a reliable link, a technically accurate measurement may be difficult to associate with the material under discussion.

An illustrative sequence is: lot identifier → sample identifier → laboratory or certificate number → reported test. This is a reading model, not a claim that every certification system uses identical fields. A reader should be able to identify which links exist, which are documented and which are missing.

Where an electronic ISTA certificate is presented, its identifying details can be checked against ISTA’s official certificate-verification facilities when the necessary access information is provided [8]. The same principle applies more broadly: the strongest documentary claim is one that can be traced to an issuer, a scope and an identifiable object.

6. How to read a certificate or report in seven checks

• Issuer. Identify the named laboratory, certification body or accreditation body. Do not treat a logo alone as evidence of authority.

• Document type. Determine whether this is a test report, seed analysis certificate, accreditation record or certification decision.

• Subject. Check whether it concerns a submitted sample, an identified lot, a variety, an organisation or a process.

• Rules and scope. Find the referenced method, certification scheme or accreditation scope. Check that the claimed activity falls within it.

• Identifiers. Match the sample, lot and document numbers, dates and any related records.

• Tested characteristics. Separate results actually measured from conclusions supplied in descriptions, headings or accompanying claims.

• Limits of interpretation. Ask what the document cannot demonstrate, especially where sampling or identity verification is undocumented.

This sequence is a complement to, not a replacement for, reading the analytical methods and numerical results. Readers seeking more detail on units, detection limits, measurement uncertainty and study design should consult the underlying laboratory method or full research paper.

7. The document must fit the question

A laboratory report can provide strong evidence for a defined measurement. Accreditation can support confidence that an organisation is competent for specified work. Certification can attest conformity to a given set of requirements. Each belongs to a different level of the evidence structure. Neither a polished document layout nor the word “certificate” makes those levels interchangeable.

For the scientific study and documentation of seed material, the decisive questions remain simple: Who issued this record? What precisely was examined? Which rules applied? How was the sample connected to the material it is said to represent? And is the final claim no broader than the evidence?

A credible document does not prove everything about a material. It supports the conclusions that its defined scope, procedure and evidence genuinely allow.

References

1. International Organization for Standardization (ISO). Conformity assessment. https://www.iso.org/conformity-assessment.html
2. ISO. ISO/IEC 17025:2017: General requirements for the competence of testing and calibration laboratories. https://www.iso.org/standard/66912.html
3. ISO. ISO/IEC 17065:2012: Conformity assessment, Requirements for bodies certifying products, processes and services. https://www.iso.org/standard/46568.html
4. International Seed Testing Association (ISTA). International Rules for Seed Testing, 2026 (including Chapter 1: Certificates and Chapter 2: Sampling). https://www.seedtest.org/en/publications/international-rules-seed-testing.html
5. ISTA. Accreditation: laboratory competence, scope, sampling and testing. https://www.seedtest.org/en/accreditation-595.html
6. Organisation for Economic Co-operation and Development (OECD). OECD Seed Schemes: varietal certification of seed. https://www.oecd.org/en/topics/sub-issues/seeds.html
7. ISTA. Variety Committee: variety verification and related methods. https://www.seedtest.org/en/technical-committees/variety-committee/VAR.html
8. ISTA. View eCertificates (official verification portal). https://www.seedtest.org/en/view-ecertificates.html