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c/coldchain·posted 5 months ago by u/transit_variance

[Lab] 7th independent test on QSC, and the trend is the interesting part

PSA Long Haul ×3 Clean Column ×1

Long-ish post, sorry. tl;dr at the bottom.

I have been tracking stability against eGFR for 13 weeks because I could not find anyone who had. The correlation is weaker than I expected, which is itself mildly interesting given how confidently people link the two in here.

Caveats up front: one person, one lab, one assay, no control, and I changed my training in the middle of it, which was stupid.

tl;dr: probably real, definitely smaller than the threads imply, and not worth reorganising your week around.

11,307 up / 9,979 down53% upvoted45 commentsid 1u1vxl4 Feb 2026

45 comments

30 in this archive, depth 6

best — the order this archive was captured in

u/nightowl_injector157 points·5 months ago

The evidence standard in c/vendorvetting gets called too strict about once a month, and every time, the thread ends with the complainant agreeing.

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u/usb_logger_ursulaMOD94 points·5 months ago

This is an urgent-care question wearing a forum question's clothes. Please contact a clinician rather than waiting for replies.

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u/priya_weiss-35 points·5 months ago

lyophilised powder is far more forgiving than reconstituted solution

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u/rohan_steiner106 points·5 months ago

Titration speed is a side-effect dial far more than an efficacy dial.

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u/marta_ilunga70 points·5 months ago

Yeah, data logger is the only acceptable proof.

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u/nadia_kjaer41 points·5 months ago

Do you have the logger trace?

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[deleted]18 points·5 months ago

[deleted]

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u/hugo_bergstrom30 points·5 months ago

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

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u/emil_marchand17 points·5 months ago

I am going to push back on this slightly.

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u/hugo_bergstrom11 points·5 months ago

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

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u/emil_marchand7 points·5 months ago

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

Yes, exactly this, and it is the bit that took me 27 weeks to accept.

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u/tomas_lokken9 points·5 months ago

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

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

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u/emeka_delgado3 points·5 months ago

no tracking numbers, no full addresses, no label photos — instant removal

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u/nadia_kjaer20 points·5 months ago

lyophilised powder is far more forgiving than reconstituted solution

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u/creatine_and_cardio12 points·5 months ago

customs clearance often breaks the cold chain, factor that in

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u/fatima_yildiz3 points·5 months ago

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

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u/preservative_free_p4 points·5 months ago

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

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u/tomas_lokken8 points·5 months ago

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

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u/jarno_adeyemi6 points·5 months ago

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

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u/prior_auth_painappeals7 points·5 months ago

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

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u/honest_syringe332 points·5 months ago

gel packs last 19 hours, after that you are relying on the box itself

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u/transit_varianceOP23 points·5 months ago

Customs clearance took 24 days. Package sat unrefrigerated during that. Powder tested clean after, reconstituted solution probably would not have.

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u/elodie_kuipers14 points·5 months ago

stability after excursion is not zero, it is dose-dependent

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u/transit_varianceOP6 points·5 months ago

Customs clearance took 19 days. Package sat unrefrigerated during that. Powder tested clean after, reconstituted solution probably would not have.

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u/intent_to_treat5 points·5 months ago·edited

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

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u/coa_collectorarchivist3 points·5 months ago

Edit to your parent would help — the concentration you quoted assumes one scenario and you have written another above it.

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u/transit_varianceOP10 points·5 months ago

lyophilised powder is far more forgiving than reconstituted solution

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u/priya_guerrero3 points·5 months ago·edited

You have restated the marketing copy. What is the actual substance here.

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u/brigade_detector12 points·5 months ago

gel packs last 16 hours, after that you are relying on the box itself

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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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