#test-results 2025-12-07

New independent result logged — WXT, lot H-2814, purity 99.4% (Medutest).

my read after three years of this: purity is mostly fine across the market and fill consistency is where suppliers differ, we shall see

what interests me is when the gap goes the same direction every time. once is noise, three times is a pattern

weigh it first

do the results in this channel skew because people test when suspicious

i test roughly every tenth vial. it is a sampling strategy, not paranoia

my sheet has 2 lots from HJ with a spread under a point, which is tight

i have never regretted spending the money on a test. i have regretted not testing twice, someone check my working

the widest spread in my data is about 2.6 percentage points across five lots from one supplier, i have it written down somewhere

weigh the vial before you reconstitute. it costs nothing and catches the common failure, ask me again in a month

is a purity-only test worth the money if underfill is the common failure

if you are testing to settle an argument you will not settle it with n of 1

99 against a certificate of 98.1 is fine. the same supplier landing low four times in a row is a question

does a bad result on one lot condemn the whole supplier

whats the lot