[Lab] 5th independent test on HJ — 99.2% on a claimed 99.0%, and the trend is the interesting part
Title says it — 5th independent test on HJ — 99.2% on a claimed 99.0%, and the trend is the interesting part — so here is the boring supporting detail that makes it worth anything. The relevant figures are 99.2% and 99.0%, and they come from the same log I have kept the whole time. Tested three lots over a year…
Kept every report as a PDF with the batch in the filename. Two years in, it is the most useful folder I own.
Yes — date of analysis, because a result from two years ago describes a different manufacturing month.
GL Biochem came back 99.3% on a claimed 99.0%, which is agreement not a discrepancy
a result with no batch number is about a vial nobody can identify
Not convinced by the comparison. Different services, different gradients, and you are treating one as ground truth.
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.
Correction: that is the claimed figure, and the measured one is the higher of the two in your own screenshot.