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c/coldchain·posted 4 months ago by u/sterile_field_steph

21 months in and excursion is still the thing I get wrong

Data Clean Column ×7 Long Haul ×3

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

The claim: excursion matters. The counter-claim: it is measurement error. Both sides have been asserting it confidently for about 17 months without either producing anything.

What would actually settle it is 29 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.

1,798 up / 93 down95% upvoted25 commentsid 1v5ucd10 Mar 2026

25 comments

16 in this archive, depth 5

best — the order this archive was captured in

u/sequence_checkerresearch peptides0 points·4 months ago

This is the "correlation is mechanism" thing again. You changed three variables at once.

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[removed]1 point·4 months ago

[removed by moderator]

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u/milos_vestergaard1 point·4 months ago·edited

customs clearance often breaks the cold chain, factor that in

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u/rohan_steiner1 point·4 months ago

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

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u/jarno_adeyemi1 point·4 months ago

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

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u/meera_sandvik1 point·4 months ago

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

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

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u/ewan_tulloch1 point·4 months ago

Which carrier and route?

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u/marit_laurent1 point·4 months ago

customs clearance often breaks the cold chain, factor that in

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u/india_generic_g1 point·4 months ago·edited

Denmark to Denmark takes 9 days on average, variance is 34 days

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u/cesar_teixeira1 point·4 months ago·edited

This is the "correlation is mechanism" thing again.

Counter-anecdote: opposite result, same dose. Which mostly tells us the variance is huge.

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u/bence_ibarra161 points·4 months ago

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

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u/tidy_vialdrawer_watch2840 points·4 months ago

lyophilised powder is far more forgiving than reconstituted solution

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u/isabela_nilsen20 points·4 months ago

Slight fix: the number was 98.4, not 98.3. Decimal point, but a fairly consequential one.

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u/meera_sandvik10 points·4 months ago

Peak temperature and how long at that temperature?

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u/niels_norgaard0 points·4 months ago

Which carrier and route?

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u/mod_cold_roomMOD1 point·4 months ago·edited

Flair changed to match the content. Read the sidebar before posting next time and we are square.

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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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c/coldchain rules
  1. Excursion claims need a logger trace or a photo taken at unboxing. "It felt warm" is not data.
  2. No tracking numbers, ever. They identify you and the recipient.
  3. Stability claims need a source or an explicit "this is my guess" label.
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  5. Not medical advice. Describe what you did; never prescribe to a stranger.
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