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[PSA] your bac water is fine, your fridge door is not

PSA Clean Column ×8 Sourced ×1

Been lurking in c/insurancefights for about 17 months and finally have something worth posting.

Short version: week 14, 10mg, and dead space is the bit I still cannot get a straight answer on. I have read the wiki, I have read the last 29 threads, and the answers split roughly down the middle.

What I actually want to know is whether the people saying it does not matter have measured it, or whether it is just repeated confidently. Happy to be told I am overthinking this — I probably am — but I would rather overthink it now than at week 20.

1,257 up / 179 down88% upvoted60 commentsid klly1326 Jul 2026

60 comments

26 in this archive, depth 5

best — the order this archive was captured in

u/yusuf_achebe97 points·2 days ago

Two vials, two different concentrations, forgot which was which, almost made a 14 times error. Now I label everything.

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u/clara_weiss46 points·2 days ago

Yeah, showing the arithmetic is the fastest way for someone to spot the error.

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u/soren_zamora44 points·2 days ago

the concentration on the vial in marker is the most important step

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[removed]70 points·2 days ago

[removed by moderator]

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u/iman_falk44 points·2 days 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/tomas_kimani15 points·1 days ago·edited

30mg vial, 2mL water, concentration is 30/2 — write it on the vial afterwards

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u/elodie_grimaldi26 points·1 days ago·edited

5mg vial, 1mL water, concentration is 5/1 — write it on the vial afterwards

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u/nadia_kjaer9 points·1 days ago

Show the arithmetic. Where did the units come from?

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u/marta_weiss6 points·1 days ago

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

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u/swirl_dont_shakereconstitution48 points·2 days ago·edited

I love that this community will spend 40 comments on a detail. That pedantry is why the numbers here matter.

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u/katrin_marchettiOP25 points·2 days ago

Two vials, two different concentrations, forgot which was which, almost made a 21 times error. Now I label everything.

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u/katrin_marchettiOP10 points·1 days ago

Cored the stopper on my 16th draw because I kept using the same entry point. Rotate the puncture site.

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u/viktor_erdogan36 points·1 days ago

I love that this community will spend 40 comments on a detail. That pedantry is why the numbers here matter.

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u/katrin_marchettiOP21 points·1 days ago

the concentration on the vial in marker is the most important step

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u/clara_weiss17 points·1 days ago

show your working or it is unhelpful

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u/quiet_reader_9928 points·3 days ago

5mg vial, 2mL water, concentration is 5/2 — write it on the vial afterwards

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u/vito_beaulieu0 points·2 days ago

swirl, do not shake, or you are courting oxidation

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u/niels_roos1 point·2 days ago·edited

swirl, do not shake, or you are courting oxidation

Yes, exactly this, and it is the bit that took me 11 weeks to accept.

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u/santiago_ndiaye1 point·2 days ago

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

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u/georgi_adebayo15 points·1 days ago
controversial sort brought me here and it was worth it
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u/priya_guerrero4 points·1 days ago

Yeah, showing the arithmetic is the fastest way for someone to spot the error.

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u/saskia_rahimi1 point·1 days ago

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

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u/honest_syringe_20253 points·1 days ago

never post a calculation as advice without stating the concentration

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u/bac_water_banditMOD10 points·2 days ago

Retitled to remove editorialising. Put the evidence in the body.

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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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