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c/coldchain·posted 1 year ago by u/jarno_karlsen

tried excursion for 2 weeks. here is what happened.

Data Sourced ×9

Trying to settle this properly because the thread from last year went in circles.

The claim: ice pack matters. The counter-claim: it is measurement error. Both sides have been asserting it confidently for about 4 months without either producing anything.

What would actually settle it is 39 people measuring the same thing the same way. I have started; my numbers are below. They lean one way but not strongly enough for me to declare victory.

If you have data, post the data. If you have an opinion, flair it as an opinion.

1,086 up / 364 down75% upvoted49 commentsid qd0zw825 Jan 2025

49 comments

26 in this archive, depth 5

best — the order this archive was captured in

u/sten_palacios89 points·1 year ago

customs clearance often breaks the cold chain, factor that in

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u/mod_cold_roommod · c/coldchain28 points·1 year ago

Disagree but this is the good kind of wrong — it is specific enough to be checked.

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u/hamza_weiss12 points·1 year ago·edited

the logger trace is the data that matters, not the packaging promises

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u/marit_laurent10 points·1 year ago

time-at-temperature integral is the dose, not just peak temperature

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u/tidy_vialdrawer_watch2866 points·1 year ago

Strongly agree. Peak temperature is not the whole story.

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u/ines_lindqvist41 points·1 year ago

I am going to push back on this slightly.

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u/sunday_shot_sal14 points·1 year ago·edited

Slight fix: the number was 96.8, not 94.2. Decimal point, but a fairly consequential one.

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u/ilias_steiner31 points·1 year ago

a warm courier van is a bigger problem for a mixed vial than for dry powder

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u/kofi_ferreira20 points·1 year ago

Every time this gets posted it hits the front page and every time someone has to re-explain it.

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u/sterile_field_steph16 points·1 year ago

Every time this gets posted it hits the front page and every time someone has to re-explain it.

Adding to this: packaging is doing more work than the comment implies.

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u/coldchain_karenMOD11 points·1 year ago·edited

Removed a chain here. The rule is one line long and it is not negotiable.

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[deleted]5 points·1 year ago

[deleted]

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u/reship_roulette8 points·1 year ago

lane reports need origin, destination, carrier, and actual transit days

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u/runa_wikstrom2 points·1 year ago

a warm courier van is a bigger problem for a mixed vial than for dry powder

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u/priya_ogunleye5 points·1 year ago

France to France takes 17 days on average, variance is 3 days

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u/cato_batista4 points·1 year ago

France to France takes 17 days on average, variance is 3 days

Yes, exactly this, and it is the bit that took me 57 weeks to accept.

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u/salma_vasquez15 points·1 year ago
four days. it took four days for me.
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u/solene_abubakar10 points·1 year ago

This is correct. Dry powder is way more robust than liquid.

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u/jarno_karlsenOP4 points·1 year ago

France to France takes 21 days on average, variance is 6 days

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u/jarno_karlsenOP11 points·1 year ago

Do you have the logger trace?

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u/hamza_weiss4 points·1 year ago

lyophilised powder is far more forgiving than reconstituted solution

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u/jarno_karlsenOP5 points·1 year ago

lane reports need origin, destination, carrier, and actual transit days

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u/sterile_field_steph7 points·1 year ago

excursion claims need a logger trace or a photo at unboxing, not "it felt warm"

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u/analog_alphabet6 points·1 year ago

Reconstituted or dry powder?

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u/spain_receta7 points·1 year ago

This is correct. Dry powder is way more robust than liquid.

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u/gustav_vermeulen2 points·1 year ago

excursion claims need a logger trace or a photo at unboxing, not "it felt warm"

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About c/coldchain

Temperature and stability in the real world: what an excursion actually costs you, why lyophilised powder is far more forgiving than reconstituted solution, how to read a logger CSV, and how to photograph a failed shipment so the conversation with the vendor is short.

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