how much does sample handling on my end affect the number
#test-results 2024-09-12
Thursday30 messages6 participantstimes are UTC
Highlights from this day
- salt_bridge — the widest spread in my data is about 2.6 percentage points across five lots from one supplier 22:16
- drawup_dee — sample handling on your end absolutely affects it. draw cleanly, ship fast, do not let it sit warm if you are testing to settle an argument you will not settle it… 22:23
- monoisotopic — i test roughly every tenth vial. it is a sampling strategy, not paranoia 22:53
- monoisotopic — the honest limits: hobby chain of custody is weak and any result here should be read with that in mind 23:00
do the results in this channel skew because people test when suspicious
the widest spread in my data is about 2.6 percentage points across five lots from one supplier
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does anyone log the negative results, the boring ones
post the lot, the purchase month, the lab, the number, and what you were expecting. that makes it useful later, ill dig out the number
sample handling on your end absolutely affects it. draw cleanly, ship fast, do not let it sit warm
if you are testing to settle an argument you will not settle it with n of 1
when did you buy it
test it again
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whats the lot
ok so a single sample tells you about a single vial. that is genuinely all it tells you, someone check my working
quick one anyone had a result they think was a lab error rather than a bad vial
weigh it first
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97.4 against a certificate of 99 is fine. the same supplier landing low four times in a row is a question
weigh the vial before you reconstitute. it costs nothing and catches the common failure
i test roughly every tenth vial. it is a sampling strategy, not paranoia
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thats not great
quantity testing is usually a separate line item and it is the one worth paying for
the honest limits: hobby chain of custody is weak and any result here should be read with that in mind
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coming back to this log the boring results too. a channel that only records failures produces a false picture
log the boring ones
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i had a result i am fairly sure was a handling error on my side and i logged it as such
a result without a lot number and a purchase date is an anecdote with a pdf attached
do you test every order or sample it
assay under label with good purity means you got less of the right thing. that is a fill problem, not a synthesis problem
follow up 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
follow up certificate said 97.4 and the independent came back 99, is that a problem
whats the underfill rate people are actually seeing
slightly off topic but my read after three years of this: purity is mostly fine across the market and fill consistency is where suppliers differ