[Meta] proposal — a flair for reconstitution posts
proposal — a flair for reconstitution posts — posting the reasoning in public because a policy you cannot inspect is just a preference.
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.
Would rather be corrected in public than confident in private.
best — the order this archive was captured in
Bacteriostatic water contains benzyl alcohol as a preservative, which is what makes repeated entry into the same vial reasonable. Plain sterile water has no preservative.
Disagree with the "more water is safer" framing. It is not safer, it is just a different number to divide by.
Bacteriostatic water contains benzyl alcohol as a preservative, which is what makes repeated entry into the same vial reasonable.
Disagreeing with this line only: adding more water is not a safety margin, it is a different divisor.
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a U-100 syringe reads 100 units to the millilitre, every time
Same. I got this wrong once, caught it because the units looked absurd, and have written on every vial since.
What is written on the vial right now?
Is that a U-100 syringe? The barrel markings change the answer completely.
The dead space question sent me down a rabbit hole for a week. It is a fraction of a unit and it is the same every draw.
Small fix — a U-100 syringe is 100 units per mL. If yours is marked differently it is not U-100 and the whole calculation changes.
That is sterile water, not bacteriostatic. Same appearance, different product, and it matters for a multi-draw vial.
Not quite. Bacteriostatic and sterile water are not interchangeable for a multi-draw vial, and the difference is the preservative.
How many mg in the vial and how many mL are you adding?
How many mg in the vial and how many mL are you adding?
Adding one thing — put the date on the label too. Concentration plus date and you can never mix two vials up.
I keep a laminated card in the drawer with the arithmetic on it. Looks ridiculous. Has never once let me draw the wrong volume.
Right — the volume you add is the only variable you control here, and the cake does not change it meaningfully.
Bacteriostatic or plain sterile water?
Careful — that arithmetic is wrong. 15mg in 3mL is 5mg/mL, so 0.25mg draws to 5 units, not what you wrote.
dead space in the needle hub is real and it is small
Reminder: this board does maths, not dosing. Nobody here tells another member what amount to take.
- 1Bacteriostatic water contains benzyl alcohol as a preservative, which is…11 comments in this branch · started by u/ahmed_rasmussen
- 2I keep a laminated card in the drawer with the arithmetic on it. Looks…6 comments in this branch · started by u/saskia_mwangi