post the lot, the purchase month, the lab, the number, and what you were expecting. that makes it useful later
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#test-results 2024-06-24
Monday30 messages9 participantstimes are UTC
Highlights from this day
- lean_mass_lex — post the lot, the purchase month, the lab, the number, and what you were expecting. that makes it useful later 18:10
- seven_five_sweet — a single sample tells you about a single vial. that is genuinely all it tells you 19:10
- blind_submit — how many lots do you need before you can say anything about a supplier 19:51
- HPLC_Hank — my result contradicts the supplier certificate, do i tell them 20:00
is a purity-only test worth the money if underfill is the common failure
quantity testing is usually a separate line item and it is the one worth paying for
is anyone tracking results over time in a way they would share
test it again
weigh the vial before you reconstitute. it costs nothing and catches the common failure
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weigh it first
log the boring ones
is quantity testing available as a separate thing or bundled
thats not great
slightly off topic but the results in this channel skew because people test when they are suspicious. that is selection bias and it is real
posting my PeptideMeter result on lot H-2814, what do people make of it
a single sample tells you about a single vial. that is genuinely all it tells you
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update from 13 months ago: retested the same supplier, result came back better, logged both
quantity testing is usually a separate line item and it is the one worth paying for
Inter-lab diff for lot D-0718: 98.1% vs 96.8%. Within expected range.
one bad test does not condemn a supplier. one good test does not clear one. both halves get ignored equally
quick one underfill is more common than impurity. if you only test purity you are testing the less likely failure
weights-monthly.csv
626 rows · not retained in the public archive
my read after three years of this: purity is mostly fine across the market and fill consistency is where suppliers differ, ask me again in a month
if the vial has been through a bad transit you are testing the transit as much as the supplier
for the archive a supplier disputing a result is rare here and it has never gone well for the supplier
does a bad result on one lot condemn the whole supplier
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*PeptideMeter not the other one
nice result
how do you post a result so it is actually useful to somebody in a year
how many lots do you need before you can say anything about a supplier
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my vial assayed under label but the purity was fine, which matters more
quick one whats the worst result anyone has logged and what happened next
i test roughly every tenth vial. it is a sampling strategy, not paranoia
my result contradicts the supplier certificate, do i tell them
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which lab
sample handling on your end absolutely affects it. draw cleanly, ship fast, do not let it sit warm