Sample COA vs lot COA: reading HPLC and MS evidence

A certificate of analysis is only evidence for the lot it names. Medabol issues a COA with HPLC purity and MS identity for every lot, and our sales team sends it before you order — this guide shows how to read one without over-reading it.

What a sample COA can and cannot do

Use a sample to understand format and vocabulary; use an applicable lot record to support a procurement decision.

What a sample can do

A sample report can show where identity, chromatogram, result and limitation statements commonly appear. It can help a team prepare a checklist before a specific lot is selected.

What a sample cannot do

It cannot establish the result, accreditation status, method coverage or release decision for another product, configuration or future lot.

The useful request

Reference the product or SKU, list the records required, and ask which documents are applicable to the material or lot under review.

• Match document to product
• Match result to lot
• Read the stated method and limitations

Specification versus lot result

One describes the expected boundary; the other reports what was stated for an identified lot under a stated method.

The target

A specification defines criteria expected for a material or test. It belongs in the agreed scope and should be read with the method and presentation it governs.

The observation

A result belongs to the material and lot named on the record. It does not automatically describe other lots, future supply or tests outside the reported method.

The reconciliation

Review whether the record is applicable, whether the method answers the intended question, and whether the stated result meets the agreed criterion.

• Identity match
• Lot match
• Method relevance
• Criterion comparison

Reading HPLC and MS evidence

Chromatographic purity and observed mass answer specific analytical questions; neither is a universal release statement by itself.

Read the method header

Instrument, detection conditions, sample preparation and integration rules affect what the chromatogram can support. A percentage without method context is incomplete.

Read observed mass in context

Mass-spectrometry information can support identity, but adducts, charge state and stated interpretation belong to the reported method and sample.

Check the applicability gate

Confirm that the report identifies the selected material and lot, then compare the stated result with the agreed criterion and review limitations.

• Identity and lot match
• Method relevance
• Result and units
• Limitations and review status

A three-gate applicability check

A compact gate sequence for deciding whether a document can answer the procurement question in front of the team.

Gate 01 / identity

Does the record name the same product, content or configuration selected in the request? If not, it may be reference material but it is not applicable evidence.

Gate 02 / lot and method

Does the lot identifier match, and does the stated method address the acceptance question?

Gate 03 / conclusion

Read the reported result, specification, units, signatures and limitations. Preserve any open point in the inquiry record rather than converting it into an implied pass.

• Record identity
• Lot linkage
• Method scope
• Result comparison
• Declared limitations