[Lab] four vendors, same compound, same week, one test each
Right: four vendors, same compound, same week, one test each. I paid for this one myself, nobody sent me anything, and the receipts are in the comments. QSC BPC, batch matched the paperwork, PeptideMeter came back 98.6% against a claimed 98.0%. Paid for it myself, posting it because the log is only worth anything if…
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.
This. The trend across separate lots is the number that tells you about a process rather than a vial.
Kept every report as a PDF with the batch in the filename. Two years in, it is the most useful folder I own.
Area percent and net peptide content are different measurements and most reports give one. Quote which, or the comparison downstream is meaningless.
post the claim next to the result or the number floats
First result I ever posted here got asked for the batch number and the claim. Fair, and my posts have been better ever since.
That service reports area percent by default. Worth stating, since the thread has been comparing it to a mass figure.
Disagree that this is a discrepancy. 97.9% against a claimed 97.5% is inside ordinary inter-lab variance in either direction.
Disagree that this is a discrepancy.
Disagreeing with this line: that gap is ordinary variance, not a contradiction between the lab and the certificate.
inter-lab variance runs a point or two, plan your outrage accordingly