Methods reading room: what analytical reports actually establish · RESEARCH-12289

Case 1 — Certificate of analysis: which claim does each measurement support?

A reagent dossier contains a summary purity percentage but not the method or underlying trace. The draft index calls it fully verified. Which parts of that label can actually be supported?

Exercise RESEARCH-12289/1: address this question within its stated limits.

Case 1 — Certificate of analysis: which claim does each measurement support?

Separate document provenance, identity, purity and the conditions measured. A percentage without its method and sample linkage cannot establish all of those claims.

Case 1 — Certificate of analysis: which claim does each measurement support?

A chromatographic peak-area figure and net material content answer different questions. Record the report’s own definition and units before comparing it with another percentage.

Case 1 — Certificate of analysis: which claim does each measurement support?

Ask whether the sample identifier, issuing laboratory, report date and relevant analytical method can be verified. A copied certificate may be genuine as a document while its relationship to the sample remains unestablished.

Case 1 — Certificate of analysis: which claim does each measurement support?

The index should list supplied evidence and missing evidence separately. Use method-specific wording rather than a blanket verified or safe label.

Case 1 — Certificate of analysis: which claim does each measurement support?

Even an authentic analytical report has scope limits. It is not by itself a demonstration of clinical efficacy, sterility or suitability for human use.

Case 1 — Certificate of analysis: which claim does each measurement support?

Proposed correction: documentation supplied; method and sample linkage incomplete. Add a dated update if verifiable primary material later resolves those gaps.

Case 2 — Two laboratories, two percentages: are they measuring the same thing?

A comparison table places chromatographic purity and net peptide content in one column. Both are percentages, but the reports define their denominators differently. How should the table be repaired?

Exercise RESEARCH-12289/2: address this question within its stated limits.

Case 2 — Two laboratories, two percentages: are they measuring the same thing?

Before comparing laboratories, ask whether sample handling, method conditions and reporting definitions are available. Missing details should be visible in the table.

Case 2 — Two laboratories, two percentages: are they measuring the same thing?

Create separate columns for the quantity measured, method, units and denominator. Do not subtract the two percentages as though they represented a disagreement about the same measurement.

Case 2 — Two laboratories, two percentages: are they measuring the same thing?

Keep the original reported values beside any reformatted presentation. A conversion or interpretation needs a documented basis; it should not silently replace the source.

Case 2 — Two laboratories, two percentages: are they measuring the same thing?

An apparent difference can motivate a method question without proving that either laboratory is wrong. The appropriate next step is clarification from the reporting laboratory.

Case 2 — Two laboratories, two percentages: are they measuring the same thing?

Use a comparison-status column: directly comparable, comparable with stated qualifications, or not established. Explain the reason for each label.

Case 2 — Two laboratories, two percentages: are they measuring the same thing?

The summary should say that different quantities were initially mixed and identify how the revised table separates them. No clinical conclusion follows from this bookkeeping correction.