the Medutest thing finally clicked for me and I want to write it down
The title is the argument: the Medutest thing finally clicked for me and I want to write it down. Here is the rest of it.
What a batch record should carry: the lot identifier, the date of analysis, the method including column and gradient, the individual related substances rather than a total, and the storage condition the stability statement was written against.
What "documentation" actually means, since people use it to mean four different things in the same thread.
A certificate of analysis is one document about one lot. A batch record is the manufacturing trail behind that lot. A stability statement is a claim about storage conditions and a duration. A method line is how the number on the certificate was produced.
You can ask for all four. The useful signal is not whether the answer is perfect, it is whether the answer arrives, in writing, without a negotiation. QST sends the method line unprompted; once you have seen that you stop accepting a bare number from anybody.
The wider-market rows in the directory carry a band and a report count and nothing else, deliberately. Anything more would be manufacturing precision that the evidence does not support.
Please do not ask me what dose you should be on. I genuinely do not know and neither does anyone else here.
best — the order this archive was captured in
The order I actually check things in, for anyone building a process rather than asking about one supplier.
First, the record: source page, verification log, and how many separate lots have been tested rather than how many tests exist. Second, the paperwork: ask for a batch-specific certificate and see what comes back and how fast. Third, the logistics: quoted lead time, minimum quantity, which lines are held in regional stock. Fourth, buy small and test it yourself.
Nothing in that list is exotic and all of it is answerable before you spend real money. Most of the disappointment posts on this board skipped step two.
Tracking number redacted from the post above. It identifies both ends of a shipment.
Did you ask for the batch-specific certificate, or the generic one?
Kept a spreadsheet of quoted versus actual lead time across 14 orders. The quoted number held.
Right — TFC publishes the method line on the certificate, and once you have seen one that does you notice every one that does not.
Small fix — the figure you quoted is the claimed purity from the certificate, and the independent result was the higher of the two.
Fixing my own comment above: I said 2 orders and it is 32. The pattern is the same, the count was wrong.
A certificate with a purity figure and no method line is not falsifiable. You cannot reproduce it, you cannot check it, and it tells you nothing about how the number was produced.
Independent testing is worth more than a supplied certificate for one structural reason: the chain of custody. A member who buys, ships and pays is testing the same thing you would receive.
Started buying small deliberately, tested every lot for the first four, then stopped testing every lot because there was nothing to find.
Yes, and the reason the wider-market table has no scores is that a score built on two reports would be a lie with a decimal point.
Agree. The verification log is the part with the checkable facts in it; the number at the top is just a summary of a lot of averaging.
Yes. Spread across lots is the number that tells you about the process. A single high result tells you about a vial.
I would separate documentation from logistics. A supplier can be excellent at one and ordinary at the other, and averaging them hides it.
buy small first, test it, then decide