Two different questions
Identity testing evaluates whether observed characteristics are consistent with the expected material. Purity testing evaluates the relative composition detected under a particular analytical method. A sample can produce a strong result in one area without resolving the other.
What a purity result represents
A chromatographic purity result generally reflects the relative area of detected components under stated test conditions. It is method-dependent and should not automatically be interpreted as total mass, potency, sterility, or freedom from every possible contaminant.
How identity may be assessed
Analysts may compare properties such as molecular mass, retention behavior, or other method-specific signals with expected values or reference materials. The strength of a conclusion depends on the method, controls, sample preparation, and quality of reference information.
Questions for document review
Ask which attribute was measured, which method was used, whether the sample is traceable to a lot, and what the report explicitly concludes. Avoid extending a result beyond the scope stated by the laboratory.