[PSA] stability is not what most of this community thinks it is
stability is not what most of this community thinks it is. If you already knew this, the post is not for you and you can scroll on.
Put a logger in three consecutive orders. Two never went above the range at all and the third spent four hours warm on a Friday. Cost me almost nothing to stop wondering.
Gel pack fully liquid on arrival, powder tested 98.6% against a claimed 98.0% afterwards. The pack had done its job for as long as it was designed to.
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.
If two or three other people have done the same thing we might actually learn something. Alone it is an anecdote.
best — the order this archive was captured in
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.
powder at room temperature for a few days is usually a non-event
Yes — a logger in the box turns a fortnight of speculation into a chart.
a logger costs less than a vial and answers the question permanently
regional stock removes most of this problem entirely
Do you know what storage condition the stability statement covers?
the excursion that matters is the one after reconstitution
a warm gel pack tells you the pack failed, not that the material did
light matters more than people think for some of these
What was the packaging — rigid outer, gel packs, anything insulating?
write the reconstitution date on the vial
write the reconstitution date on the vial
This is the distinction that resolves most threads here — powder and solution are different problems.
Is this a line they hold in regional stock or is it shipping from origin?
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.
Ordered from the warehouse in the Netherlands instead of origin and the transit went from a fortnight to 4 days. Entirely different proposition in August.
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.
Asked SSA which lines they hold regionally and got a straight list back. That answered my summer ordering question completely.
Split an order across two months deliberately to compare summer and winter transit on the same lane. Four days difference, same carrier.
Split an order across two months deliberately to compare summer and winter transit on the same lane.
Disagreeing with this line only: freezing a reconstituted vial is not a safe default.
Correction: that stability figure covers the lyophilised powder, not the reconstituted solution. Different claim entirely.
Cosigning the regional stock point. Ordering from a warehouse in France took the whole question off my table.
Cosigning the regional stock point.
andres_restrepo is right that the pack failing is not the material failing. Two separate claims.
That is the ambient temperature at the destination, not the temperature inside the box. The logger measures the second one.
Which lane, and had it been quoted at that transit time?
This. A liquid gel pack on arrival tells you about the pack’s duty cycle, not about the vial.
the door shelf is the worst place in the fridge
transit temperature is a distribution, not a number
lyophilised powder is far more forgiving than the panic threads suggest
Right, and asking what the stability statement was written against is one line of email that reframes everything.
- 1light matters more than people think for some of these12 comments in this branch · started by u/ms_fragmenter
- 2Cosigning the regional stock point. Ordering from a warehouse in France took…10 comments in this branch · started by u/andres_restrepo