One thing that is still open after PeptideChemSF’s answer:
What did you change at the same time, and can you separate the two now?
DoseLogDan said:If you are comparing against somebody else’s result, check that you are comparing the same measurement taken the same way.
This is where I part company with the consensus forming above. The objection nobody has made: this only works if the measurement is doing what we assume it is doing, and that assumption has not been tested here.
DoseLogDan said:If you are comparing against somebody else’s result, check that you are comparing the same measurement taken the same way.
Right, and the exception is worth naming rather than left implied, because the exception is where people get into trouble.
If somebody has the primary source to hand I would rather cite it than paraphrase it.
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Shop Reference StandardsDoseLogDan said:If you are comparing against somebody else’s result, check that you are comparing the same measurement taken the same way.
Genuinely useful, thank you. I had the facts and not the framework. Taking it to my next appointment.
Reporting back.
Update: the thing I was blaming turned out not to be the cause. Leaving the original post as written rather than editing it, so the mistake stays visible for whoever searches this next.