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c/reconstitution·posted 12 months ago by u/nabila_espinoza

[Question] how do you actually verify insulin syringe

Question Clean Column ×1 Cold Box ×3

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

The advice on bacteriostatic water 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.

2,999 up / 405 down88% upvoted24 commentsid 17fvoc30 Jul 2025

24 comments

12 in this archive, depth 3

best — the order this archive was captured in

u/marta_weiss160 points·12 months ago

Cored the stopper on my 6th draw because I kept using the same entry point. Rotate the puncture site.

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u/runa_grimaldi-17 points·12 months ago

stopper coring on the 16th draw because you keep using the same entry point. rotate.

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u/nabila_espinozaOP118 points·12 months ago

Dead space ate 11 units on a low-volume draw. Tiny impact at 10mg, massive impact at 2.5mg.

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u/nabila_espinozaOP61 points·12 months ago

dosing errors come from people reconstituting two vials differently and forgetting which is which

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u/sofia_danquah125 points·12 months ago

10mg vial, 2mL water, concentration is 10/2 — write it on the vial afterwards

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u/RetaAndRegret254 points·12 months ago

more water means more units for the same dose, which means finer resolution

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u/viktor_kirchner0 points·12 months ago·edited

Cosigning. The concentration on the vial in marker is load-bearing.

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u/soren_zamora1 point·12 months ago

No. This is the kind of confident post that gets copied into a screenshot and repeated for years. Where is the evidence.

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u/liv_nkemelu1 point·12 months ago

u-100 syringe, not u-40, or your math is off by factor of 20

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u/ines_lindqvist42 points·12 months ago·edited

Crossposting this to c/semaglutide because the people who need it are not reading this community.

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u/vial_math_verasyringe math17 points·12 months ago
appreciate you saying you do not know
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u/alcohol_aversion17 points·12 months ago·edited

Spent 12 weeks confused about concentration math until someone showed me the table. 5mg, 3mL, concentration is 5/3.

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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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