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c/reconstitution·submitted 1 months ago by u/adaeze_cabrera

someone explain concentration to me like I have not read a paper in years

Explainerbranch of 6 comments

Asking properly rather than in a comment on somebody else’s thread: someone explain concentration to me like I have not read a paper in years. 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…

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6 comments, started 1 months ago
u/bac_water_banditMOD355 points·1 months ago

Corrected the concentration in the title, which contradicted the body. Nothing else touched.

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u/rasmus_kuipers148 points·1 months ago

Pushback on the syringe advice: a U-100 barrel reads units of volume. Calling them "doses" is how the confusion starts.

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u/mateusz_achebe38 points·1 months ago

dead space in the needle hub is real and it is small

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u/alcohol_aversion19 points·1 months ago

dead space in the needle hub is real and it is small

Adding one thing — put the date on the label too. Concentration plus date and you can never mix two vials up.

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u/adaeze_cabrera115 points·1 months ago

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

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u/lurker_for_years103 points·1 months ago

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