[Discussion] we need a standard template or these posts are unsearchable
Something I keep coming back to: we need a standard template or these posts are unsearchable.
Kept every report as a PDF with the batch in the filename. Two years in, it is the most useful folder I own.
How to build a series that means something, if you are going to spend money on testing anyway.
Three tests on one lot tells you about your measurement. Three tests on three lots, spread over a year, tells you about a process. The second is the one worth paying for and it costs the same.
Buy small, keep the batch numbers, send one vial per lot, and post each one with the claim next to it. After four or five you have something no individual review can give you: a band, a direction and a date range. That is what the source pages are made of.
On inter-lab disagreement, which generates more heat here than anything else.
Two services running different gradients, integrating differently, at possibly different wavelengths, will not produce identical numbers on the same material. A point either way is ordinary. Half a point is close agreement.
The productive response to a gap that size is to post both results with both methods and let the log accumulate. The unproductive response is to pick the lower number, call it the truth, and open a dispute. Members have done the first for long enough now that the bands in the vendor tables are genuinely informative.
Screenshot none of this. Read the whole thread, including the parts where I am told I am wrong.
best — the order this archive was captured in
Inter-lab variance on this assay runs roughly a point either way, driven mostly by gradient and integration. Two results inside that band agree; they do not disagree quietly.
vendor, compound, batch, service, result — that is the template
the trend across lots is worth more than any single figure
Correction: that is the claimed figure, and the measured one is the higher of the two in your own screenshot.
Date of analysis anchors the result to a manufacturing period. A two-year-old result is evidence about two years ago and should be read that way.
Tested three lots over a year rather than three vials from one lot. Cost the same and told me something completely different.
The template is vendor, compound, batch, service, claim, result, and who paid. Every one of those fields exists because a result missing it has been argued about here before.
Split one vial between Medutest and PeptideMeter. The two numbers were within half a point of each other and I stopped worrying about which lab to trust.
First result I ever posted here got asked for the batch number and the claim. Fair, and my posts have been better ever since.
First result I ever posted here got asked for the batch number and the claim.
Agreed — and two services on one batch is the strongest thing any of us can produce individually.
Cosigning on saying who paid. It is the whole basis on which this log is worth anything.
inter-lab variance runs a point or two, plan your outrage accordingly
Area percent or net peptide content?
split a vial across two services once and you will never argue about ground truth again
results without method are gossip with decimals
How many separate lots does your series cover?
If the report gives a mass spectrum as well as UV purity, say so. Identity and relative quantity are separate claims and the log tracks both.
If the report gives a mass spectrum as well as UV purity, say so.
This is why the template has a batch field. Without it the result is about a vial nobody can identify.
BCH came back 97.7% on a claimed 97.5%, which is agreement not a discrepancy
Agreed on quoting the claim alongside the result. Half the arguments here are two people comparing to different reference numbers.
Area percent and net peptide content are different measurements and most reports give one. Quote which, or the comparison downstream is meaningless.
- 1First result I ever posted here got asked for the batch number and the…12 comments in this branch · started by u/reship_roulette
- 2Inter-lab variance on this assay runs roughly a point either way, driven…7 comments in this branch · started by u/piotr_nascimento