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c/reconstitution·submitted 4 months ago by u/vial_math_vera

three years of mg/mL threads, summarised so you do not have to read them

Discussionbranch of 6 comments

three years of mg/mL threads, summarised so you do not have to read them — a position I have arrived at slowly and would like tested. Why "more water" keeps confusing people, including me for a month. The vial contains a fixed amount of peptide. Water changes nothing about that amount. What it changes is…

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6 comments, started 4 months ago
u/bruno_dumitru20 points·4 months ago

Reconstituted at 2mL when I meant to use a different volume. Caught it because the units looked wrong on the barrel. Now I write 2.5mg/mL on the glass before I put the cap back.

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u/ismael_nwosu23 points·4 months ago

write the concentration on the vial in marker, that is the whole post

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u/priya_weiss18 points·4 months ago

Did the maths give you a whole number of units, or a fraction?

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u/kavya_radich32 points·4 months 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/arto_falk18 points·4 months ago

aim the stream at the glass wall, not at the cake

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u/arne_restrepo8 points·4 months ago

30mg into 3mL is 10mg/mL, and 2mg of that is 20 units

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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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