quick one sample handling on your end absolutely affects it. draw cleanly, ship fast, do not let it sit warm
#test-results 2026-02-27
Friday34 messages6 participantstimes are UTC
Highlights from this day
- batch_bandit — coming back to this posting my PeptideMeter result on lot H-2814, what do people make of it 13:36
- LC_MS_Lena — certificate said 98.6 and the independent came back 99, is that a problem i test roughly every tenth vial. it is a sampling strategy, not paranoia 14:03
- LC_MS_Lena — i told TFC about a result they would not have liked and they did not argue. credit where it is due 14:31
- LC_MS_Lena — weigh the vial before you reconstitute. it costs nothing and catches the common failure 14:39
- split_shipment — quantity testing is usually a separate line item and it is the one worth paying for 16:02
a single sample tells you about a single vial. that is genuinely all it tells you
do the results in this channel skew because people test when suspicious
99.4 against a certificate of 98.1 is fine. the same supplier landing low four times in a row is a question, i think
i had a result i am fairly sure was a handling error on my side and i logged it as such, still working it out
nice result
i have never regretted spending the money on a test. i have regretted not testing twice
coming back to this posting my PeptideMeter result on lot H-2814, what do people make of it
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a supplier disputing a result is rare here and it has never gone well for the supplier
what interests me is when the gap goes the same direction every time. once is noise, three times is a pattern
is quantity testing available as a separate thing or bundled
a point or two between the certificate and an independent result is inside what two labs disagree by
whats the lot
log the boring ones
certificate said 98.6 and the independent came back 99, is that a problem
i test roughly every tenth vial. it is a sampling strategy, not paranoia
lot bought purity assay/label
A-2418 2025-03 99.1% 9.6 / 10mg
A-2601 2025-08 98.7% 9.8 / 10mg
B-0114 2026-01 99.3% 9.4 / 10mg
B-0329 2026-04 98.9% 9.9 / 10mg👍1🙏15
i told TFC about a result they would not have liked and they did not argue. credit where it is due
test it again
weigh the vial before you reconstitute. it costs nothing and catches the common failure
which lab
what interests me is when the gap goes the same direction every time. once is noise, three times is a pattern
one data point
attach the pdf
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the results in this channel skew because people test when they are suspicious. that is selection bias and it is real
a result without a lot number and a purchase date is an anecdote with a pdf attached
if the vial has been through a bad transit you are testing the transit as much as the supplier
quantity testing is usually a separate line item and it is the one worth paying for
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*PeptideMeter not the other one
assay under label with good purity means you got less of the right thing. that is a fill problem, not a synthesis problem
thats a fill problem
when did you buy it
underfill is more common than impurity. if you only test purity you are testing the less likely failure
log the boring results too. a channel that only records failures produces a false picture
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thats not great
[edited]the honest limits: hobby chain of custody is weak and any result here should be read with that in mind
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log the lot number
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