[redacted at member request] · archive policy
my read after three years of this: purity is mostly fine across the market and fill consistency is where suppliers differ
#test-results 2025-12-19
Friday44 messages10 participantstimes are UTC
Highlights from this day
- blank_run — follow up whats the worst result anyone has logged and what happened next 18:53
- pbs_pip — the results in this channel skew because people test when they are suspicious. that is selection bias and it is real i had a result i am fairly sure was a handling… 19:05
- quiet_head_qi — my vial assayed under label but the purity was fine, which matters more 19:52
- pbs_pip — how much does sample handling on my end affect the number 20:14
- pbs_pip — is anyone tracking results over time in a way they would share 20:52
follow up whats the worst result anyone has logged and what happened next
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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, i think
lot bought purity assay/label
A-2418 2025-03 99.1% 9.6 / 10mg
A-2601 2025-08 98.7% 9.8 / 10mg
B-0114 2026-01 99.3% 9.4 / 10mg
B-0329 2026-04 98.9% 9.9 / 10mgi told GGPeps about a result they would not have liked and they did not argue. credit where it is due
is a purity-only test worth the money if underfill is the common failure
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the results in this channel skew because people test when they are suspicious. that is selection bias and it is real
i had a result i am fairly sure was a handling error on my side and i logged it as such
lot bought purity assay/label
A-2418 2025-03 99.1% 9.6 / 10mg
A-2601 2025-08 98.7% 9.8 / 10mg
B-0114 2026-01 99.3% 9.4 / 10mg
B-0329 2026-04 98.9% 9.9 / 10mg🧊1👍16
quantity testing is usually a separate line item and it is the one worth paying for
underfill is more common than impurity. if you only test purity you are testing the less likely failure
the honest limits: hobby chain of custody is weak and any result here should be read with that in mind
thats within range
assay under label with good purity means you got less of the right thing. that is a fill problem, not a synthesis problem
has a supplier ever disputed a result posted here
whats the underfill rate people are actually seeing
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selection bias
posting my Medutest result on lot E-2205, what do people make of it
the widest spread in my data is about 2.6 percentage points across five lots from one supplier
which lab
if you are testing to settle an argument you will not settle it with n of 1
log the lot number
Channel stats, last 30 days: 59 messages from 56 members.
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my vial assayed under label but the purity was fine, which matters more
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certificate said 96.8 and the independent came back 97.4, is that a problem
a supplier disputing a result is rare here and it has never gone well for the supplier
*VendorInvestigate not the other one
log the boring ones
nice result
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how much does sample handling on my end affect the number
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is it worth testing if the vial has already been through a warm transit
how do you separate batch variance from supplier variance
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i have never regretted spending the money on a test. i have regretted not testing twice
my result contradicts the supplier certificate, do i tell them
i have never regretted spending the money on a test. i have regretted not testing twice
slightly off topic but anyone tested the same lot twice at different labs
is anyone tracking results over time in a way they would share
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update from 14 months ago: retested the same supplier, result came back better, logged both, for what its worth
one data point
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99.4 against a certificate of 98.1 is fine. the same supplier landing low four times in a row is a question
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update on the earlier thing does anyone log the negative results, the boring ones
a single sample tells you about a single vial. that is genuinely all it tells you
do you test every order or sample it
test it again
log the boring results too. a channel that only records failures produces a false picture
post the lot, the purchase month, the lab, the number, and what you were expecting. that makes it useful later
whats the lot