quantity testing is usually a separate line item and it is the one worth paying for
#test-results 2025-09-24
Wednesday47 messages10 participantstimes are UTC
Highlights from this day
- the_bet_2026 — a result without a lot number and a purchase date is an anecdote with a pdf attached 18:55
- bo_bloodwork — update from 9 months ago: retested the same supplier, result came back better, logged both 19:18
- tesa_tess — genuine question how many lots do you need before you can say anything about a supplier i told SSA about a result they would not have liked and they did not argue.… 21:52
anyone had a result they think was a lab error rather than a bad vial
genuine question sample handling on your end absolutely affects it. draw cleanly, ship fast, do not let it sit warm
a result without a lot number and a purchase date is an anecdote with a pdf attached
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my result contradicts the supplier certificate, do i tell them
thats a fill problem
do the results in this channel skew because people test when suspicious
a single sample tells you about a single vial. that is genuinely all it tells you, thats one data point
the honest limits: hobby chain of custody is weak and any result here should be read with that in mind
log the lot number
one data point
my read after three years of this: purity is mostly fine across the market and fill consistency is where suppliers differ
update from 9 months ago: retested the same supplier, result came back better, logged both
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right so how much does sample handling on my end affect the number
97.4 against a certificate of 99.2 is fine. the same supplier landing low four times in a row is a question
i test roughly every tenth vial. it is a sampling strategy, not paranoia
nice result
a supplier disputing a result is rare here and it has never gone well for the supplier
test it again
the results in this channel skew because people test when they are suspicious. that is selection bias and it is real
log the boring results too. a channel that only records failures produces a false picture
i test roughly every tenth vial. it is a sampling strategy, not paranoia
*that should say weekly
posting my Medutest result on lot B-0329, what do people make of it
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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
a point or two between the certificate and an independent result is inside what two labs disagree by
weigh the vial before you reconstitute. it costs nothing and catches the common failure
post the lot, the purchase month, the lab, the number, and what you were expecting. that makes it useful later
i test roughly every tenth vial. it is a sampling strategy, not paranoia
a point or two between the certificate and an independent result is inside what two labs disagree by
one bad test does not condemn a supplier. one good test does not clear one. both halves get ignored equally
whats the underfill rate people are actually seeing
my read after three years of this: purity is mostly fine across the market and fill consistency is where suppliers differ
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, n of 1 obviously
is a purity-only test worth the money if underfill is the common failure
[edited]quick one does anyone log the negative results, the boring ones
what interests me is when the gap goes the same direction every time. once is noise, three times is a pattern
has a supplier ever disputed a result posted here
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weigh it first
quick one i told QSC about a result they would not have liked and they did not argue. credit where it is due
which lab
when did you buy it, not advice obviously
genuine question how many lots do you need before you can say anything about a supplier
i told SSA about a result they would not have liked and they did not argue. credit where it is due
🙏1🤝6
the widest spread in my data is about 2.6 percentage points across five lots from one supplier
i had a result i am fairly sure was a handling error on my side and i logged it as such
certificate said 99 and the independent came back 98.6, is that a problem
attach the pdf
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thats not great
| Evidence | Counts? |
|---|---|
| Independent report, lot you bought, lot number legible | yes |
| Independent report, no lot number | no |
| Supplier certificate only | no |
| Screenshot of a report | no |
| Blinded pooled submission | yes, for the pool |
| A friend who said it was fine | no |
i have never regretted spending the money on a test. i have regretted not testing twice, anyway
slightly off topic but whats the lot