why does nobody talk about bacteriostatic water
why does nobody talk about bacteriostatic water. I would rather ask a basic question now than get this wrong quietly for two months. Adding more water does not change how much peptide is in the vial. It changes the concentration, which changes the volume you draw for the same amount. That is the entire relationship.…
Yes, and the dead-space point is worth repeating: it is small, it is real, and it is the same for every draw.
That is sterile water, not bacteriostatic. Same appearance, different product, and it matters for a multi-draw vial.
swirl, never shake
Pushback on the syringe advice: a U-100 barrel reads units of volume. Calling them "doses" is how the confusion starts.
The arithmetic in full: concentration is mass over volume, so 10mg into 3mL gives 3.33mg/mL. A U-100 syringe is graduated at 100 units per millilitre, so 0.5mg is 0.5 divided by 3.33 millilitres, which is 15 units.
The arithmetic in full: concentration is mass over volume, so 10mg into 3mL gives 3.33mg/mL.
This is the sentence that makes the rest unnecessary. Write it on the vial and the problem is gone.
Agreed — units are volume. Once that lands, the rest of the arithmetic is one division.