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c/reconstitution·submitted 8 months ago by u/quiet_reader_99

how much of what we believe about concentration actually comes from mg/mL threads

Questionbranch of 6 comments

Asking properly rather than in a comment on somebody else’s thread: how much of what we believe about concentration actually comes from mg/mL threads. 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…

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6 comments, started 8 months ago
u/anya_antonsen282 points·8 months ago

Same. I got this wrong once, caught it because the units looked absurd, and have written on every vial since.

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u/vial_math_veraMOD151 points·8 months ago

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

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u/karim_ilunga188 points·8 months ago·edited

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

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/quiet_reader_99OP122 points·8 months ago

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

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u/rasmus_mensah42 points·8 months ago

bacteriostatic water has the preservative, sterile water does not

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u/RetaAndRegret2-28 points·8 months ago

bacteriostatic water has the preservative, sterile water does not

Disagreeing with this line only: adding more water is not a safety margin, it is a different divisor.

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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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