coming back after 24 months with a follow up result, where do i put it
#test-results 2026-06-25
Thursday51 messages9 participantstimes are UTC
Highlights from this day
- sgp_subq — a point or two between the certificate and an independent result is inside what two labs disagree by 19:29
- sgp_subq — is anyone tracking results over time in a way they would share 19:30
- lyophile_liv — i have never regretted spending the money on a test. i have regretted not testing twice 20:24
- VialBot — Channel stats, last 30 days: 132 messages from 27 members. 21:59
my read after three years of this: purity is mostly fine across the market and fill consistency is where suppliers differ
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98.6 against a certificate of 96.8 is fine. the same supplier landing low four times in a row is a question
weigh it first
if you are testing to settle an argument you will not settle it with n of 1
how much does sample handling on my end affect the number
the honest limits: hobby chain of custody is weak and any result here should be read with that in mind
the widest spread in my data is about 2.6 percentage points across five lots from one supplier
anyone tested the same lot twice at different labs
for the archive underfill is more common than impurity. if you only test purity you are testing the less likely failure
selection bias
i told QYB about a result they would not have liked and they did not argue. credit where it is due
is a purity-only test worth the money if underfill is the common failure
has a supplier ever disputed a result posted here
weigh the vial before you reconstitute. it costs nothing and catches the common failure
posting my PeptideMeter result on lot F-1330, what do people make of it
log the boring ones
whats the underfill rate people are actually seeing
a supplier disputing a result is rare here and it has never gone well for the supplier
whats the lot
how do you post a result so it is actually useful to somebody in a year
sample handling on your end absolutely affects it. draw cleanly, ship fast, do not let it sit warm
anyone had a result they think was a lab error rather than a bad vial
what interests me is when the gap goes the same direction every time. once is noise, three times is a pattern
my result contradicts the supplier certificate, do i tell them
how many lots do you need before you can say anything about a supplier
Verification log updated: QST — evidence added, status unchanged.
a point or two between the certificate and an independent result is inside what two labs disagree by
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is anyone tracking results over time in a way they would share
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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, anyway
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log the lot number
test it again
assay under label with good purity means you got less of the right thing. that is a fill problem, not a synthesis problem
one bad test does not condemn a supplier. one good test does not clear one. both halves get ignored equally
my sheet has 8 lots from HJ with a spread under a point, which is tight
how do you separate batch variance from supplier variance
a single sample tells you about a single vial. that is genuinely all it tells you
i test roughly every tenth vial. it is a sampling strategy, not paranoia
[edited]right so i had a result i am fairly sure was a handling error on my side and i logged it as such
i have never regretted spending the money on a test. i have regretted not testing twice
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if the vial has been through a bad transit you are testing the transit as much as the supplier
is it worth testing if the vial has already been through a warm transit
post the lot, the purchase month, the lab, the number, and what you were expecting. that makes it useful later
certificate said 96.8 and the independent came back 98.1, is that a problem
underfill is more common than impurity. if you only test purity you are testing the less likely failure
does a bad result on one lot condemn the whole supplier
do the results in this channel skew because people test when suspicious
my vial assayed under label but the purity was fine, which matters more
thats not great, thats one data point
Channel stats, last 30 days: 132 messages from 27 members.
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nice result