How a certificate is read, what happens to material in transit, and what changes between a vial and a sealed pen. Written from our own lot data.
A certificate of analysis is only useful if you can tell which parts of it are evidence and which parts are decoration. Here is what each field means and what it does not.
Cold chain is discussed as though it were binary, but shipping is a temperature curve rather than a state. Here is what the curve looks like and which parts of it matter.
The difference between a pre-filled pen and a vial is not convenience. It is where the measurement error lives, and how many times the material is exposed to open air.