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.
§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.
| Parameter | Criterion | What it establishes |
|---|---|---|
| Method stability-indicating status | Demonstrated under CEI-MS-13 | Detection of degradation |
| Aggregate determination performed | Yes | Detection of freeze-induced aggregation |
| pH monitored | Yes | Detection of freeze-concentration pH shift |
| Timepoints | Cover the claimed period plus one interval | Adequacy 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.
- 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
Identifiers are reproduced only where the Institute holds them. Where a digital object identifier or PubMed identifier is not shown, the Institute has recorded the journal and year and has not constructed an identifier.
Compound Evidence Institute · CEI-MS-21/5 · https://compoundevidence.com/methods/freeze-thaw/acceptance-criteria/ · retrieved 30 July 2026