What an inconclusive peptide identity result means
An inconclusive result means the available evidence did not establish the requested identity within the accepted method. It is not an automatic pass or failure.
Read the finding with its limitation
An expected molecular mass is one part of an identity assessment. The observed signal must be interpretable within the method and the intended target must be adequately defined. A short name or supplier code may not specify a single chemical form.
Read the laboratory’s actual conclusion. “Not confirmed,” “not detected,” and “inconsistent with the expected target” are different statements. Ask for clarification if the report does not explain which question remained unresolved.
Questions for the issuing laboratory
Find out whether the limitation concerned the amount detected, the sample matrix, the evidence obtained, the target specification, or the availability of suitable reference information. These are questions to investigate, not assumptions about what happened to your sample.
- Was the expected target and chemical form agreed?
- Was there enough interpretable evidence under the method?
- Which conclusion does the result support?
- Would another preparation, technique or sample address the limitation?
Do not fill in the missing conclusion
A purity percentage does not establish identity by itself. Likewise, a signal at an expected mass does not answer every structural question. The final wording should stay within what the complete analytical evidence supports.
Avoid describing an inconclusive report as verified simply because another value on the page looks plausible. Ask the laboratory to resolve inconsistent wording before using the report in a decision or sharing it publicly.
Agree any further work
Further testing should start with a defined question and an accepted scope. Ask what new evidence is expected, whether another sample is required, and how the subsequent report will relate to the original.
Keep the original record available and identify any later issue clearly. A new result should explain the additional work; it should not silently erase an earlier limitation.
Continue with your sample or report
Further reference
Sources and related guidance for this article:
- ICH Q2(R2): Validation of Analytical Procedures
Framework for evaluating analytical procedure performance; this reference does not certify CPT or an individual result.
- CPT testing methods and reporting scope
Published service scope and technique-specific reporting information.