my sheet has 2 lots from SGN with a spread under a point, which is tight
#test-results 2025-03-25
Tuesday40 messages10 participantstimes are UTC
Highlights from this day
- ten_of_ten — quantity testing is usually a separate line item and it is the one worth paying for 15:03
- ten_of_ten — quick one a single sample tells you about a single vial. that is genuinely all it tells you 15:39
- blind_submit — how do you post a result so it is actually useful to somebody in a year 16:28
- vialkeeper — a point or two between the certificate and an independent result is inside what two labs disagree by 19:04
- VialBot — Testing queue: 9 submissions open, 81 awaiting dispatch. 20:31
one bad test does not condemn a supplier. one good test does not clear one. both halves get ignored equally
genuine question how much does sample handling on my end affect the number
thats a fill problem
i had a result i am fairly sure was a handling error on my side and i logged it as such
selection bias
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sample handling on your end absolutely affects it. draw cleanly, ship fast, do not let it sit warm
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quantity testing is usually a separate line item and it is the one worth paying for
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does a bad result on one lot condemn the whole supplier
which lab
coming back to this is anyone tracking results over time in a way they would share
assay under label with good purity means you got less of the right thing. that is a fill problem, not a synthesis problem
quick one a single sample tells you about a single vial. that is genuinely all it tells you
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 / 10mgone data point
coming back after 18 months with a follow up result, where do i put it
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thats not great
anyone had a result they think was a lab error rather than a bad vial
i test roughly every tenth vial. it is a sampling strategy, not paranoia
how do you post a result so it is actually useful to somebody in a year
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 / 10mgdoes anyone log the negative results, the boring ones
coming back to this if you are testing to settle an argument you will not settle it with n of 1
i have never regretted spending the money on a test. i have regretted not testing twice
my vial assayed under label but the purity was fine, which matters more
whats the underfill rate people are actually seeing
when did you buy it
how do you separate batch variance from supplier variance
a supplier disputing a result is rare here and it has never gone well for the supplier
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99.2 against a certificate of 99.4 is fine. the same supplier landing low four times in a row is a question
Inter-lab diff for lot SG-1177: 98.1% vs 99.4%. Within expected range.
my read after three years of this: purity is mostly fine across the market and fill consistency is where suppliers differ
Digest for the week of 2024-06-25 has been published.
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is a purity-only test worth the money if underfill is the common failure
log the boring results too. a channel that only records failures produces a false picture
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a point or two between the certificate and an independent result is inside what two labs disagree by
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is quantity testing available as a separate thing or bundled
log the boring ones
if the vial has been through a bad transit you are testing the transit as much as the supplier
Testing queue: 9 submissions open, 81 awaiting dispatch.
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has a supplier ever disputed a result posted here
is it worth testing if the vial has already been through a warm transit
[edited]Purity check: no report on file for lot H-2814. Nothing logged either way.