genuine question about bacteriostatic water that I am slightly embarrassed to ask
genuine question about bacteriostatic water that I am slightly embarrassed to ask. Searched first, found three threads that contradict each other, hence the post. Wrote the date on the vial as well as the concentration after losing track of which one was opened first. Shook the first vial because nobody told me not…
Working has to be shown on arithmetic posts. Added a note asking for it rather than removing this one.
a U-100 syringe reads 100 units to the millilitre, every time
if the maths gives you a fraction of a unit, change the concentration
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 percent and it is dwarfed by fill tolerance.
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.
Are you accounting for the powder volume, or is that where the confusion is?
Reconstituted at 2mL when I meant to use a different volume. Caught it because the units looked wrong on the barrel. Now I write 10mg/mL on the glass before I put the cap back.
bacteriostatic water has the preservative, sterile water does not
Spent 23 weeks confused about this until somebody drew the table for me. 30mg, 3mL, 10mg/mL, 2mg is 20 units. That is the whole thing.
5mg into 1mL is 5mg/mL, and 0.75mg of that is 15 units