coming back after 19 months with a follow up result, where do i put it
#test-results 2026-02-08
Sunday35 messages8 participantstimes are UTC
Highlights from this day
- bac_water_bill — what interests me is when the gap goes the same direction every time. once is noise, three times is a pattern, anyway 08:36
- bea_reconstitutes — do you test every order or sample it 09:55
- bac_water_bill — follow up the honest limits: hobby chain of custody is weak and any result here should be read with that in mind 10:56
- HPLC_Hank — slightly off topic but whats the worst result anyone has logged and what happened next 11:27
my result contradicts the supplier certificate, do i tell them
what interests me is when the gap goes the same direction every time. once is noise, three times is a pattern, anyway
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99.4 against a certificate of 97.4 is fine. the same supplier landing low four times in a row is a question
thats within range
i told Homopeptide about a result they would not have liked and they did not argue. credit where it is due
posting my VendorInvestigate result on lot KP-0925, what do people make of it
how do you post a result so it is actually useful to somebody in a year
one bad test does not condemn a supplier. one good test does not clear one. both halves get ignored equally
the honest limits: hobby chain of custody is weak and any result here should be read with that in mind
update from 2 months ago: retested the same supplier, result came back better, logged both
test it again
do you test every order or sample it
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my sheet has 3 lots from JEEP with a spread under a point, which is tight
attach the pdf
| 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 |
*PeptideMeter not the other one
weigh the vial before you reconstitute. it costs nothing and catches the common failure
follow up the honest limits: hobby chain of custody is weak and any result here should be read with that in mind
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is anyone tracking results over time in a way they would share
chromatogram-overlay.png
1240 × 720 · 484 KB · not retained in the public archive
a supplier disputing a result is rare here and it has never gone well for the supplier, happy to be corrected
log the boring ones
i had a result i am fairly sure was a handling error on my side and i logged it as such
my vial assayed under label but the purity was fine, which matters more
medutest-report-g-0641.pdf
3 pages · 824 KB · not retained in the public archive
log the boring results too. a channel that only records failures produces a false picture
when did you buy it
slightly off topic but whats the worst result anyone has logged and what happened next
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underfill is more common than impurity. if you only test purity you are testing the less likely failure
sample handling on your end absolutely affects it. draw cleanly, ship fast, do not let it sit warm
assay under label with good purity means you got less of the right thing. that is a fill problem, not a synthesis problem
whats the lot
anyone had a result they think was a lab error rather than a bad vial
is it worth testing if the vial has already been through a warm transit
certificate said 99.2 and the independent came back 99, is that a problem
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 / 10mgwhich lab
thats not great
how much does sample handling on my end affect the number