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Testing methods

What does LC-MS testing actually prove?

What the method supports, what it misses and why the data matter.

AnswersUpdated 2026-09-24
01

Separation and signals

LC-MS separates sample components and measures mass-to-charge signals.

02

Method-specific findings

Appropriate methods and data can support identity. An expected mass alone does not prove every structural detail.

03

Separate questions

Identity evidence does not establish sterility, every contaminant or the measured content of every vial.

The short answer

LC-MS separates a sample and measures mass-to-charge signals. It can support compound identification when the method and data are appropriate.

An expected mass alone is not proof of every structural detail. LC-MS identity evidence does not establish sterility, all contaminants, a universal purity value or the content of every vial.

What the method does

Liquid chromatography separates components over time. Mass spectrometry measures their mass-to-charge signals. The laboratory interprets those data against the expected material and the method used.

What to ask the laboratory

  • What was tested and how was the sample identified?
  • What evidence supports the reported identity?
  • What does the method distinguish, and what are its limitations?
  • Are the relevant spectra and chromatograms available?

Separate the questions

QuestionEvidence to review
IdentityThe laboratory's identity method and supporting data
Chromatographic purityThe stated method, result and trace
Measured vial contentA content assay with units and a sampling basis
Endotoxin or microbial findingsThe separate tests actually performed
SterilityA separate sterility assessment, not an LC-MS identity result
Our documentation boundaryAvailable certificates vary by lot. Review the actual report rather than assuming a fixed test panel. Sterility is not tested; products are for laboratory research only.
A useful next step

Read the method with the result.

Review the tested sample, identification method and supporting data. Available certificates vary; a familiar method name is not proof of a fixed test panel.

Read the COA guide →
Continue reading

Read the COA guide

Continue with the supporting guidance. Research information does not establish legal clearance or clinical suitability.