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c/reconstitution·submitted 2 years ago by u/janek_ferrari

[Meta] proposal — a flair for units posts

PSAbranch of 7 comments

proposal — a flair for units posts, and it will stay as it is unless somebody makes the case to change it. I keep a laminated card in the drawer with the arithmetic on it. Looks ridiculous. Has never once let me draw the wrong volume. Research-use-only material is not approved for human use, so treat everything in…

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7 comments, started 2 years ago
u/viktor_erdogan1.3k points·2 years ago

Adding more water does not change how much peptide is in the vial. It changes the concentration, which changes the volume you draw for the same amount. That is the entire relationship.

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u/india_generic_g834 points·2 years ago

Cosigning the round-number approach. Reconstituting to something awkward is how you end up drawing 27.5 units at six in the morning.

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u/quarter_dose_queenlow and slow498 points·2 years ago

Cosigning the round-number approach.

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/janek_ferrariOP302 points·2 years ago

How many mg in the vial and how many mL are you adding?

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u/viktor_kirchner-19 points·2 years ago

more water is not more drug, it is the same drug in a bigger volume

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u/ilias_cabrera1 point·2 years ago

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

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u/priya_guerrero246 points·2 years ago

the powder cake sits at the bottom, the volume you add is the volume that counts

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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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