Independent · non-commercial · publishes on a quarterly cycle|Current cycle 2026 Q3
Compound Evidence InstituteEvidence synthesis · established 2023Graded assessments of compounds, trials, methods and supply
Document set current to 30 July 2026
Methodological standard · §5

CEI-MS-21 — system suitability and acceptance criteria

The performance the system must demonstrate, and the criteria a result must meet to be reportable.

Document identifier
CEI-MS-21/5
Series
Methodological standard
Version
1.0
Published
16 Jun 2026
Last reviewed
16 Jun 2026
Next review
16 Jun 2029
Identifier
10.71829/cei.meth.18
Certainty
High
Cycle
2026 Q2
Category
Stability

§5System suitability and acceptance criteria

§5.1System suitability

Table 1. System suitability criteria. A determination is reportable only where every criterion is met at the time of analysis.

ParameterCriterionWhat it establishes
Method stability-indicating statusDemonstrated under CEI-MS-13Detection of degradation
Aggregate determination performedYesDetection of freeze-induced aggregation
pH monitoredYesDetection of freeze-concentration pH shift
TimepointsCover the claimed period plus one intervalAdequacy of the claim envelope

§5.2Acceptance criteria

  • An in-use period is supportable only where every monitored attribute remains within its acceptance criterion throughout the claimed period and the method is stability-indicating.
  • Purity data alone do not support an in-use claim for any compound in a class prone to aggregation.
  • In the absence of such data the Institute publishes no in-use claim, and records that the manufacturer of one approved lyophilised peptide claims only three hours after reconstitution — a figure arrived at with full stability data.

§5.3Limitations

References cited on this page

References are numbered in order of first citation in this document. Each superscript in the text links to its entry below.

  1. International Council for Harmonisation of Technical Requirements for Pharmaceuticals for Human Use. ICH Q1A(R2) Stability Testing of New Drug Substances and Products. ICH Harmonised Tripartite Guideline 2003;Step 4 version. identifier not held by the Institute

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