a result without a lot number and a purchase date is an anecdote with a pdf attached
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#test-results 2024-06-02
Sunday23 messages6 participantstimes are UTC
Highlights from this day
- LC_MS_Lena — a result without a lot number and a purchase date is an anecdote with a pdf attached 23:04
- lot_number_lou — i told QST about a result they would not have liked and they did not argue. credit where it is due 23:16
- HPLC_Hank — my read after three years of this: purity is mostly fine across the market and fill consistency is where suppliers differ one bad test does not condemn a supplier.… 23:18
- private_script_pri — the widest spread in my data is about 2.6 percentage points across five lots from one supplier 23:33
- split_dose_sam — post the lot, the purchase month, the lab, the number, and what you were expecting. that makes it useful later 23:40
weigh it first
if you are testing to settle an argument you will not settle it with n of 1, i think
posting my PeptideMeter result on lot C-4402, what do people make of it
attach the pdf
weigh the vial before you reconstitute. it costs nothing and catches the common failure
ok so sample handling on your end absolutely affects it. draw cleanly, ship fast, do not let it sit warm
[edited]i told QST about a result they would not have liked and they did not argue. credit where it is due
my read after three years of this: purity is mostly fine across the market and fill consistency is where suppliers differ
one bad test does not condemn a supplier. one good test does not clear one. both halves get ignored equally
while im here update from 24 months ago: retested the same supplier, result came back better, logged both
what interests me is when the gap goes the same direction every time. once is noise, three times is a pattern
*VendorInvestigate not the other one
one data point
quick one how much does sample handling on my end affect the number
log the lot number
🔥1⚠️4
the widest spread in my data is about 2.6 percentage points across five lots from one supplier
📈16⚠️3❤️8
when did you buy it
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a supplier disputing a result is rare here and it has never gone well for the supplier
post the lot, the purchase month, the lab, the number, and what you were expecting. that makes it useful later
i have never regretted spending the money on a test. i have regretted not testing twice
quick one a single sample tells you about a single vial. that is genuinely all it tells you
certificate said 98.6 and the independent came back 97.4, is that a problem
my vial assayed under label but the purity was fine, which matters more