if the vial has been through a bad transit you are testing the transit as much as the supplier
#test-results 2024-09-21
Saturday27 messages8 participantstimes are UTC
Highlights from this day
- drawup_dee — sample handling on your end absolutely affects it. draw cleanly, ship fast, do not let it sit warm 14:26
- nordic_price_nils — my sheet has 4 lots from QST with a spread under a point, which is tight 14:59
- salt_bridge — underfill is more common than impurity. if you only test purity you are testing the less likely failure 15:20
selection bias
test it again
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which lab
attach the pdf
how much does sample handling on my end affect the number
*Medutest not the other one
sample handling on your end absolutely affects it. draw cleanly, ship fast, do not let it sit warm
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log the lot number
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 / 10mgposting my Medutest result on lot A-2601, what do people make of it
my sheet has 4 lots from QST with a spread under a point, which is tight
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whats the worst result anyone has logged and what happened next
right so how do you post a result so it is actually useful to somebody in a year
underfill is more common than impurity. if you only test purity you are testing the less likely failure
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assay under label with good purity means you got less of the right thing. that is a fill problem, not a synthesis problem
what interests me is when the gap goes the same direction every time. once is noise, three times is a pattern
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log the boring ones
ok so i told GL Biochem about a result they would not have liked and they did not argue. credit where it is due
do you test every order or sample it
a supplier disputing a result is rare here and it has never gone well for the supplier
certificate said 99.2 and the independent came back 99, is that a problem
thats not great
does a bad result on one lot condemn the whole supplier
the honest limits: hobby chain of custody is weak and any result here should be read with that in mind
update from 3 months ago: retested the same supplier, result came back better, logged both
Channel stats, last 30 days: 66 messages from 15 members.
post the lot, the purchase month, the lab, the number, and what you were expecting. that makes it useful later, anyway