This is a continuation of a long topic, addressed by post number rather than by page. Start at post 1.
An honest declaration on reporting a discrepancy: I have a prior here and it is strong enough that you should weight what I say downward. Stating it rather than hiding it.
Coming back to post #62, because the follow-up matters more than the original answer.
Photograph the vial and the label before opening. It costs ten seconds and it is what turns a report into something checkable.
Taking post #64 at face value and following it one step further.
An update on my earlier reporting a discrepancy post: the pattern held for another six weeks and then stopped, which I did not predict and cannot explain.
Reports of ordinary results are more valuable than reports of remarkable ones, precisely because only the remarkable ones get posted elsewhere.
Written quickly, so the reasoning may be tighter than the wording.
I read post #66 twice before replying, because I had assumed the opposite.
If the supplier was asked about a discrepancy, include what they said verbatim rather than summarised. The wording of a response is informative.
I have written this out at length because the short version keeps being misread.
Do not adjust a reported figure. Post what the laboratory said and put your interpretation in a separate sentence.
It took me longer than it should have to see that.
Post #66 put the caveat in the right place and I want to underline it.
On reporting a discrepancy the community has more anecdote than the confidence in this thread implies, and I include my own contribution in that.
Adding what did not work for me on reporting a discrepancy, since the failures never get written up and they are half the useful information.
Dosing and purity: a vial that is 99% pure might contain 80% of its label claim if the other mass is water, counter-ion, and excipient. Purity and content are different. Both matter for different reasons.
The short answer was in the first line; everything after is the working.
The claim about reporting a discrepancy upthread is stronger than its source supports. I have read the source. The source says "associated with" and the post says "causes".
The documentation on reporting a discrepancy is better than this thread and I say that as someone who has posted in the thread.
Nothing to add on the substance. Thank you for taking the question at face value.
Everything in post #73 holds. The case it does not cover is the one I have.
Do not adjust a reported figure. Post what the laboratory said and put your interpretation in a separate sentence.
I keep a log of this specifically because memory is unreliable about it.
Reports of ordinary results are more valuable than reports of remarkable ones, precisely because only the remarkable ones get posted elsewhere.
Worth saying I have only my own numbers here, and n is small.
Photograph the vial and the label before opening. It costs ten seconds and it is what turns a report into something checkable.
One more caveat and then I will stop qualifying: the sample selected itself.
On post #80 — agreed on the reasoning, with one qualification.
A methods point on reporting a discrepancy rather than a substantive one: if the comparison is not like for like, the difference you are measuring is the difference in method.
Selective submission and selective reporting are the two easiest ways for a result to be shaped, and blinding addresses the first while a commitment to post addresses the second.
Quietly grateful for the plain phrasing. Not every thread gets that.
The version of reporting a discrepancy that circulates here is a simplification of a simplification. It is not wrong, but it has lost the conditions under which it holds, and those conditions are where the interesting cases live.
I have no financial interest in anything named in this thread and I want to say so before I comment on reporting a discrepancy, because it is the sort of subject where it matters.
Practical answer on reporting a discrepancy, since the theoretical one is upthread: do the simplest check first, write down the result, and only then decide whether the complicated explanation is needed. It usually is not.
If the supplier was asked about a discrepancy, include what they said verbatim rather than summarised. The wording of a response is informative.
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