Peptide testing accreditation: scope, methods and limits

Evidence summary: ISO/IEC 17025 accreditation concerns a laboratory's competence for activities listed in its formal scope. It is not blanket certification of every test, product or lot. A defensible review checks the laboratory, accrediting body, current certificate, exact method and scope before interpreting a lot-specific result.

Key findings

  • Accreditation is limited to the tests and ranges in the published scope.
  • A valid laboratory process does not certify the manufacturing history or safety of a submitted sample.
  • HPLC purity, LC-MS identity and quantitative content require distinct fit-for-purpose methods.

What ISO/IEC 17025 establishes

ISO/IEC 17025 sets requirements for competent, impartial and consistent testing and calibration laboratories. Accreditation bodies assess a laboratory against the standard, but the meaningful evidence is the laboratory's current scope—not the logo alone.

A scope identifies the materials, measurands, methods and ranges covered. Work outside that scope may still be performed by the laboratory, but it should not be represented as accredited work.

How to verify an accreditation claim

Locate the certificate through the accrediting body's own directory, confirm its status and dates, then open the accompanying scope. Match the named legal entity and location to the report and match the stated method to the analysis performed.

PeptidesDirect does not currently publish documentary evidence that CertikLabs is ISO/IEC 17025 accredited. This guide therefore makes no accreditation or independence claim for that laboratory.

Methods still need validation

Accreditation does not make every result interchangeable. ICH Q2 describes characteristics including specificity, accuracy, precision, linearity and range. The appropriate characteristics depend on whether a method identifies a peptide, separates impurities or quantifies content.

HPLC area purity is method-dependent. LC-HRMS can support molecular identity, while a quantitative assay requires suitable standards and calibration. Each result must stay within its method's stated purpose.

What a passing report cannot establish

A report describes the submitted sample and performed tests. It does not by itself prove chain of custody, manufacturing controls, sterility, endotoxin status, biological activity, or suitability for human use.

Accreditation of a testing activity and cGMP controls over pharmaceutical manufacturing are different systems. Research Use Only labeling is not a substitute for either one.

Continue to the full evidence guide

Read the laboratory verification guide

Frequently asked questions

Does ISO 17025 certify a peptide lot?

No. It accredits a laboratory for defined activities; the report provides results for the submitted sample within the methods shown.

How do I check a laboratory's scope?

Use the accrediting body's directory and match the entity, location, dates, material, method and measurand.

Is a high HPLC result enough?

No. It does not independently establish molecular identity, content, sterility or safety.

Primary references

  1. International Organization for Standardization ISO/IEC 17025 — Testing and calibration laboratories. ISO. 2017. Source
  2. International Laboratory Accreditation Cooperation ILAC G18: Guideline for Describing Scopes of Accreditation. ILAC. 2024. Source
  3. International Council for Harmonisation Q2(R1): Validation of Analytical Procedures. ICH. 2005. Source
  4. Boyne MT, et al. Liquid Chromatography-High Resolution Mass Spectrometry for Peptide Drug Quality Control. AAPS J. 2015. PubMed 25716148

Research Use Only. Not for human or veterinary use. This page is not dosing or medical guidance.