the results in this channel skew because people test when they are suspicious. that is selection bias and it is real, from memory
the results in this channel skew because people test when they are suspicious. that is selection bias and it is real
#test-results 2026-06-23
Tuesday31 messages9 participantstimes are UTC
Highlights from this day
- vial_ledger — i have never regretted spending the money on a test. i have regretted not testing twice 19:55
- first_month_fi — the honest limits: hobby chain of custody is weak and any result here should be read with that in mind 20:16
- vial_ledger — i had a result i am fairly sure was a handling error on my side and i logged it as such 20:35
ok so how much does sample handling on my end affect the number
i have never regretted spending the money on a test. i have regretted not testing twice
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my sheet has 5 lots from WXT with a spread under a point, which is tight
do you test every order or sample it
whats the lot
the honest limits: hobby chain of custody is weak and any result here should be read with that in mind
📈3❤️10
Recon calculator: 5mg in 1ml = 8mg/ml.
i had a result i am fairly sure was a handling error on my side and i logged it as such
👍2🙏10
99.2 against a certificate of 99 is fine. the same supplier landing low four times in a row is a question
one bad test does not condemn a supplier. one good test does not clear one. both halves get ignored equally
if the vial has been through a bad transit you are testing the transit as much as the supplier
when did you buy it
thats not great
📉2
i told GL Biochem about a result they would not have liked and they did not argue. credit where it is due
which lab
quantity testing is usually a separate line item and it is the one worth paying for
does anyone log the negative results, the boring ones
test it again
the widest spread in my data is about 2.6 percentage points across five lots from one supplier
a supplier disputing a result is rare here and it has never gone well for the supplier
a point or two between the certificate and an independent result is inside what two labs disagree by
how many lots do you need before you can say anything about a supplier
a result without a lot number and a purchase date is an anecdote with a pdf attached
post the lot, the purchase month, the lab, the number, and what you were expecting. that makes it useful later
*that should say weekly
is it worth testing if the vial has already been through a warm transit
a single sample tells you about a single vial. that is genuinely all it tells you
my result contradicts the supplier certificate, do i tell them
anyone tested the same lot twice at different labs
weigh the vial before you reconstitute. it costs nothing and catches the common failure