three years of cold chain threads, summarised so you do not have to read them
Posting this as a discussion rather than a claim: three years of cold chain threads, summarised so you do not have to read them.
A transit temperature logger records a distribution, and time above a threshold matters as much as peak temperature. That is the argument for logging rather than guessing.
Gel packs are designed for a duty cycle. A liquid pack at the end of a longer-than-expected transit is a pack behaving as specified, not evidence of an excursion in the vial.
A stability statement is only meaningful with its conditions attached: temperature, duration, light exposure, and whether it covers powder or solution. Ask which.
Would rather be corrected in public than confident in private.
best — the order this archive was captured in
You cannot infer potency from a temperature record. The record tells you what happened to the box; only a test tells you what happened to the material.
Once in solution, the relevant risks are hydrolysis, aggregation and, for some sequences, oxidation. Refrigeration slows all three; freezing a solution introduces a separate risk at the ice interface.
That is the ambient temperature at the destination, not the temperature inside the box. The logger measures the second one.
Lyophilisation removes the water that drives most degradation pathways. That is why the dry cake is comparatively robust and the reconstituted solution is not.
Lyophilisation removes the water that drives most degradation pathways.
Disagreeing with this line only: freezing a reconstituted vial is not a safe default.
Regional stock changes the question rather than answering it: shorter lanes mean less exposure and fewer variables, which is why the warehouse question is worth asking before ordering in summer.
[removed by moderator]
the door shelf is the worst place in the fridge
write the reconstitution date on the vial