Certified Reference Materials and Research Reagents

A certificate of analysis and a certified reference material answer different questions. A report describes findings for a sample; a certified reference material, or CRM, supplies specified property values with documented uncertainty and traceability. The word “certified” should therefore be read with the property, value and intended use—not as a blanket description of everything in a container.

This guide explains how to review that distinction when planning laboratory measurements. It does not designate any Peptides Centre Canada product as a reference material or claim that a supplier report establishes CRM status.

What a reference material certificate establishes

The International Vocabulary of Metrology definition of a CRM centres on documented property values, their uncertainties and their traceabilities, established using valid procedures. For quantitative properties, a numerical value without its uncertainty and traceability information leaves out part of that definition.

Read the scope property by property. If documentation assigns a certified value to one constituent, do not extend that status to another constituent, a different property or an unlisted use. Likewise, a document headed “certificate of analysis” should not be treated as proof of CRM status merely because of its title. Check what the issuer actually certifies.

Match the material to the measurement task

Canada’s National Research Council describes CRM uses in instrument calibration, method validation and quality control. Those are different tasks. Before selecting a material, write down the property your procedure measures and the role the material will play. A convenient material name is not a substitute for that requirement.

As a practical review sequence, compare the certificate with your method’s specified property, sample type, working range and intended application. Record any mismatch for the responsible laboratory reviewer. A material suitable for one check should not silently become the reference for a different measurement.

Separate certified values from other information

NIST’s guidance on reference materials explains that its Standard Reference Materials may include both certified and non-certified information, distinguished in the documentation. The certificate also identifies intended use, instructions and certification validity. Revisions can change assigned values or uncertainties.

Keep the certificate version used for the work, not just a bookmark to the latest web page. Check the material identifier and any relevant validity conditions before relying on a value. Follow the producer’s instructions for that material; a general storage rule cannot replace its certificate.

For example, imagine a fictional certificate with a certified value for property A and an informational value for property B. An experiment depending on B cannot describe B as certified because A is certified. The distinction survives copying the number into a worksheet or a research summary.

Traceability belongs to the result

Metrological traceability links a measurement result to a specified reference through documented calibrations and their uncertainty contributions. It is different from tracking a vial’s lot or shipping history. Traceability also does not, by itself, establish that the uncertainty is small enough for a particular decision or that no mistake occurred.

Our lot-traceability guide addresses the material-record side of this distinction. For interpreting the uncertainty attached to a result, see laboratory measurement uncertainty. Neither a lot identifier nor a calibration sticker completes the evidence for a specific result.

Questions to retain in the laboratory record

The following questions form a suggested review aid, not a certification procedure:

• Which exact property and value does the certificate identify as certified?
• What uncertainty, units and traceability statement accompany that value?
• Does the intended use match this measurement task?
• Which material identifier and certificate version apply?
• Which handling, validity or use conditions must be met?
• Who will resolve any mismatch before the value is used?

Preserve the answers alongside the method and material records. For the broader report-reading workflow, including sample identifiers and method scope, see how to read a certificate of analysis.

Laboratory research education only. Reference-material terminology does not establish product authorization, safety, efficacy or suitability for human or veterinary use. This article makes no certification or testing claim about a product sold by Peptides Centre Canada.