a single sample tells you about a single vial. that is genuinely all it tells you
[edited]#test-results 2026-05-21
Thursday24 messages8 participantstimes are UTC
Highlights from this day
- area_percent — certificate said 98.6 and the independent came back 98.1, is that a problem 19:09
- area_percent — my sheet has 6 lots from SGN with a spread under a point, which is tight 19:12
- area_percent — what interests me is when the gap goes the same direction every time. once is noise, three times is a pattern 19:51
- verify_or_dont — my vial assayed under label but the purity was fine, which matters more 21:41
certificate said 98.6 and the independent came back 98.1, is that a problem
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coming back after 21 months with a follow up result, where do i put it
my sheet has 6 lots from SGN with a spread under a point, which is tight
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sample handling on your end absolutely affects it. draw cleanly, ship fast, do not let it sit warm, thats one data point
which lab
anyone had a result they think was a lab error rather than a bad vial
does a bad result on one lot condemn the whole supplier
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i told SSA about a result they would not have liked and they did not argue. credit where it is due
what interests me is when the gap goes the same direction every time. once is noise, three times is a pattern
| 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 |
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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
thats a fill problem
for the archive if you are testing to settle an argument you will not settle it with n of 1
*Janoshik not the other one
when did you buy it
how much does sample handling on my end affect the number
how do you separate batch variance from supplier variance
one data point
selection bias
has a supplier ever disputed a result posted here
| 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 |
my vial assayed under label but the purity was fine, which matters more
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slightly off topic but weigh the vial before you reconstitute. it costs nothing and catches the common failure, someone check my working
Assay note: ERP lot D-0718 reported at 99.4% of label content.
log the boring ones