Test Reports and Certificates of Conformity
Read the content before the heading
Documents called certificates, reports or declarations can contain very different information. A test report may give measured results, methods and sample details. A certificate of conformity may state that requirements have been met without listing every underlying measurement. The label alone cannot establish which evidence is available.
Begin by asking what was measured, by whom and on which sample. Then ask who made any broader statement about meeting requirements. A supplier’s declaration and a testing laboratory’s result may both be useful, but they perform different jobs in the research file.
Find the requirement being assessed
“Conforms” needs an object: a named specification, contract requirement or standard. Record its identifier and version. If the criterion is described only as “high quality”, ask for a measurable definition before interpreting the statement as evidence of suitability for your experiment.
The European Accreditation FAQ on conformity statements explains the need for an identified specification and decision rule in the laboratory context. A numerical result and a pass label are connected through that rule; the label does not explain the connection by itself.
Ask how the decision was made
A measured value close to a limit raises questions about uncertainty and the chosen rule. Some reporting arrangements provide a numerical result without any conformity judgement. Others provide both. Do not add your own pass stamp to a result without documenting the criterion and how you assessed it.
The ILAC guidance series includes G8 on decision rules and conformity statements. It is a useful primary reference when discussing these arrangements with a laboratory. It does not mean that a supplier certificate automatically follows that guidance.
Build a complete research record
Keep the statement, the referenced specification and the supporting test report together where available. If underlying data are unavailable, record the nature of the supplier assurance and the remaining evidence gap. A short declaration should not be expanded into claims about tests it never mentions.
When reviewing a file from the COA library, distinguish reported measurements from declarations in the surrounding product description. Check whether the statement refers to the tested sample, a named batch or a wider production system.
Finish with a use-specific assessment. A document can accurately state conformity with one requirement while leaving another experimental need unanswered. That is a reason to identify the missing requirement, rather than treating all certificates as equivalent.
Related research reading
Explore the research blog and original batch-document library for further context.