tried gradient for 23 weeks. here is what happened.
I have had 11 orders now and I keep a table, so here is the honest summary rather than a vibe.
Material has been consistent. Communication has not. Shipping has varied by about 40 days on nominally the same lane, which matters more in summer than in February.
The independent number came back 93.7% against a claimed 98.6%, which I read as agreement rather than a discrepancy — inter-lab variance on this assay is a point or two either way and treating one lab as ground truth is how people end up in pointless arguments with vendors.
Batch number is in the comments. Ask if you want the method.
best — the order this archive was captured in
This is an urgent-care question wearing a forum question's clothes. Please contact a clinician rather than waiting for replies.
state the method: column, gradient, detection wavelength, injection volume
I love that this community will spend 40 comments on a detail. That pedantry is why the numbers here matter.
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Detection wavelength? chromatogram and that changes at different wavelengths.
This is the correct method framing. Column and gradient are load-bearing fields.
area% and mass% are not the same and this whole post conflates them
The VendorInvestigate result being close to my own HPLC is the signal, not the absolute number. Both are right.
chromatogram or it did not happen
This is the correct method framing. Column and gradient are load-bearing fields.
integration decision on a shoulder changes your number by half a point on its own
- 1I love that this community will spend 40 comments on a detail. That pedantry…6 comments in this branch · started by u/andres_restrepo
- 2chromatogram or it did not happen4 comments in this branch · started by u/elodie_grimaldi