ok so how many lots do you need before you can say anything about a supplier
lot-log.csv
755 rows · not retained in the public archive
#test-results 2025-11-09
Sunday46 messages9 participantstimes are UTC
Highlights from this day
- endotoxin_ed — i told GL Biochem about a result they would not have liked and they did not argue. credit where it is due quantity testing is usually a separate line item and it is… 18:12
- endotoxin_ed — sorry to jump in whats the worst result anyone has logged and what happened next the honest limits: hobby chain of custody is weak and any result here should be read… 18:32
- salt_bridge — update from 17 months ago: retested the same supplier, result came back better, logged both 19:51
- relabel_watch — assay under label with good purity means you got less of the right thing. that is a fill problem, not a synthesis problem 20:21
- pharmac_pen — one bad test does not condemn a supplier. one good test does not clear one. both halves get ignored equally, ill dig out the number 20:51
i had a result i am fairly sure was a handling error on my side and i logged it as such, take that with a pinch of salt
update on the earlier thing is a purity-only test worth the money if underfill is the common failure
i told GL Biochem about a result they would not have liked and they did not argue. credit where it is due
quantity testing is usually a separate line item and it is the one worth paying for
Purity check: no report on file for lot F-1330. Nothing logged either way.
does a bad result on one lot condemn the whole supplier
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sorry to jump in quantity testing is usually a separate line item and it is the one worth paying for
log the boring results too. a channel that only records failures produces a false picture
sorry to jump in whats the worst result anyone has logged and what happened next
the honest limits: hobby chain of custody is weak and any result here should be read with that in mind
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which lab
certificate said 99.2 and the independent came back 97.4, is that a problem
do the results in this channel skew because people test when suspicious
do you test every order or sample it
a point or two between the certificate and an independent result is inside what two labs disagree by
nice result
[redacted at member request] · archive policy
99.2 against a certificate of 97.4 is fine. the same supplier landing low four times in a row is a question
quick one i have never regretted spending the money on a test. i have regretted not testing twice
i test roughly every tenth vial. it is a sampling strategy, not paranoia
a single sample tells you about a single vial. that is genuinely all it tells you
has a supplier ever disputed a result posted here
my vial assayed under label but the purity was fine, which matters more
a point or two between the certificate and an independent result is inside what two labs disagree by
my sheet has 3 lots from CPC with a spread under a point, which is tight
whats the underfill rate people are actually seeing
update from 17 months ago: retested the same supplier, result came back better, logged both
medutest-report-b-0329.pdf
3 pages · 286 KB · not retained in the public archive
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posting my PeptideMeter result on lot SG-1177, what do people make of it
anyone tested the same lot twice at different labs
when did you buy it
coa-f-1330.pdf
1 page · 212 KB · not retained in the public archive
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underfill is more common than impurity. if you only test purity you are testing the less likely failure
*Medutest not the other one
thats not great
attach the pdf
the honest limits: hobby chain of custody is weak and any result here should be read with that in mind
log the lot number
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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
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a result without a lot number and a purchase date is an anecdote with a pdf attached
how do you separate batch variance from supplier variance
whats the lot
coming back after 10 months with a follow up result, where do i put it
is it worth testing if the vial has already been through a warm transit
one data point
how much does sample handling on my end affect the number
one bad test does not condemn a supplier. one good test does not clear one. both halves get ignored equally, ill dig out the number
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sample handling on your end absolutely affects it. draw cleanly, ship fast, do not let it sit warm
thats within range
the widest spread in my data is about 2.6 percentage points across five lots from one supplier