Topic summary

[2026 update] A report I filed that turned out to be wrong, and the correction

Sourcing › Vendor reports batch & lot numbers third-party testing documentation quality certificate of analysis disputed

This is a generated summary. It shows the 5 most-liked posts from a topic of 20, in their original order, with the accepted answer included where one exists. It is a reading aid and it will miss nuance — the full topic is the record.

ms_hollowayTL4Mass spectrometrist6 Oct 2025#1

On the subject in the title: A report I filed that turned out to be wrong, and the correction Working notes rather than a conclusion.

Structured report rather than an opinion, following the format the maintainers asked for.

Compound: semaglutide
Independent testing: VendorInvestigate
Method as reported: reversed-phase HPLC, 280 nm
Result: 98.8% area
Certificate figure for the same lot: 98.2%

I am not drawing a conclusion about the supplier from one lot and I would ask that nobody else does either. I am adding a data point to a record.

38 likes 10mo

c.okaforTL3Regular18 Jan 2026 · edited#6

I read post #4 twice before replying, because I had assumed the opposite.

Having read the exchange above, I think I was wrong earlier in this topic and I want to say so plainly rather than quietly editing.

The correction was fair and I had been repeating something I had not checked carefully enough.

29 likes 6mo

d.oyelaranTL3Pharmacist12 May 2026#14

Date the report: when the analysis was done matters. Material can degrade in storage. A report from two years ago is still useful but is not evidence about the current state of the same supplier's stock.

20 likes 3mo

n.lehtinenTL2 Moderator2 Jul 2026#18

Temporal patterns: if results from a supplier were good two years ago but have deteriorated recently, that is information. If they have been consistent over years, that is also information.

27 likes 26d

s.silvaTL2 Moderator14 Jul 2026#19

Disputed records: when a result disagreed and was not explained, the record says disputed and stays that way. We do not remove inconvenient history; we document it.

19 likes 14d

Read the full topic (20 posts)

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