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c/reconstitution·posted 1 year ago by u/vial_math_vera

how much of what we believe about bacteriostatic water actually comes from units threads

Explainer

Asking properly rather than in a comment on somebody else’s thread: how much of what we believe about bacteriostatic water actually comes from units threads.

Shook the first vial because nobody told me not to. It was fine, but I have swirled every one since.

Wrote the date on the vial as well as the concentration after losing track of which one was opened first.

Started reconstituting everything to a round concentration and the six-in-the-morning error rate went to zero.

If somebody has the same thing measured a different way, post it next to mine and we will see whether they agree.

0 up / 0 down41% upvoted7 commentsid 13juxm23 Jan 2025

7 comments

7 in this archive, depth 3

best — the order this archive was captured in

u/bac_water_banditMOD7 points·1 year ago

Left up and flaired Explainer — the numbers in this one check out.

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[deleted]5 points·1 year ago

[deleted]

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u/vial_math_veraOPsyringe math4 points·1 year ago

What is written on the vial right now?

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u/santiago_ndiaye4 points·1 year ago

If your calculation produces a fraction of a unit, the concentration is wrong for your dose. Change the water volume until the numbers land on whole units.

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u/oskar_ibarra3 points·1 year ago

This. Showing the working is the fastest way for somebody else to spot the mistake.

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u/erez_perrin2 points·1 year ago

a U-100 syringe reads 100 units to the millilitre, every time

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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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