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7.8k

three years of units threads, summarised so you do not have to read them

Explainer Cold Box ×8 Long Haul ×3 Receipts ×1

Something I noticed reading old threads that I have not seen said out loud.

The advice on insulin syringe in this community changed substantially around the start of last year, and nobody went back and updated the older posts. So depending on which thread the search engine hands you, you get two contradictory answers with the same confidence.

I have listed what I think the current consensus is below. Correct me — that is the point of posting it.

8,944 up / 1,108 down89% upvoted45 commentsid 18ju3421 Jun 2025

45 comments

23 in this archive, depth 5

best — the order this archive was captured in

u/ruben_cabrera681 points·1 year ago

stopper coring on the 5th draw because you keep using the same entry point. rotate.

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u/adaeze_cabrera197 points·1 year ago

Is that 20mg vial or 19mg?

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u/dexa_twice_yearlyOPbody comp115 points·1 year ago

Is that 20mg vial or 19mg?

Disagree on that part. 99.2% and 99.3% on the same vial is normal.

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u/soren_zamora91 points·1 year ago

Are you using a u-100 or u-40 syringe? That changes everything.

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u/marisol_frisk73 points·1 year ago·edited

stopper coring on the 3th draw because you keep using the same entry point. rotate.

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u/alcohol_aversion327 points·1 year ago·edited

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

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u/soren_zamora199 points·1 year ago

This is correct. 2mL versus 22mL is the common mistake.

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[removed]78 points·1 year ago

[removed by moderator]

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u/wanjiru_varga202 points·1 year ago
the VendorInvestigate number or it did not happen
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u/dexa_twice_yearlyOPbody comp48 points·1 year ago

Reconstituted at 3mL when I meant 15mL. Caught it because the units looked wrong. Write the concentration.

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u/tuva_kirchner160 points·1 year ago

Is that 15mg vial or 4mg?

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u/anya_antonsen144 points·1 year ago
this should be in the wiki
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u/vial_math_veraMOD55 points·1 year ago

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

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u/signe_grimaldi68 points·1 year ago

Are you using a u-100 or u-40 syringe? That changes everything.

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u/oskar_kaufmann96 points·1 year ago

This is correct. 2mL versus 18mL is the common mistake.

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About c/reconstitution

The arithmetic and the technique. Bacteriostatic versus sterile water, reconstitution volume as a concentration choice, converting mg/mL into insulin-syringe units, dead space, swirl-not-shake, stopper coring, and how long a reconstituted vial is actually good for. Math errors get corrected fast and politely.

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