how much of what we believe about mg/mL actually comes from insulin syringe threads
how much of what we believe about mg/mL actually comes from insulin syringe threads, and I want the answer with the reasoning attached rather than just the conclusion. The lyophilised cake displaces a small volume, so the true concentration is very slightly lower than the arithmetic suggests. It is a fraction of a…
bacteriostatic water has the preservative, sterile water does not
If your calculation produces a fraction of a unit, the concentration is wrong for your dose. Change the water volume until the numbers land on whole units.
That only works if the fill weight is exactly the label weight, and it usually is not exactly anything.
What is written on the vial right now?
Not quite. Bacteriostatic and sterile water are not interchangeable for a multi-draw vial, and the difference is the preservative.
Cosigning the round-number approach. Reconstituting to something awkward is how you end up drawing 27.5 units at six in the morning.
Same. I got this wrong once, caught it because the units looked absurd, and have written on every vial since.
aim the stream at the glass wall, not at the cake