[Discussion] units are doing more work than we give it credit for
The title is the argument: units are doing more work than we give it credit for. Here is the rest of it. Started reconstituting everything to a round concentration and the six-in-the-morning error rate went to zero. The dead space question sent me down a rabbit hole for a week. It is a fraction of a unit and it is…
I keep a laminated card in the drawer with the arithmetic on it. Looks ridiculous. Has never once let me draw the wrong volume.
That is sterile water, not bacteriostatic. Same appearance, different product, and it matters for a multi-draw vial.
a U-100 syringe reads 100 units to the millilitre, every time
more water is not more drug, it is the same drug in a bigger volume
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.
bacteriostatic water has the preservative, sterile water does not
label the vial with the date as well as the concentration
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.
reconstituting at a round concentration makes every later dose easy
What concentration did you actually reconstitute at, rather than what did you intend to?
20mg into 1mL is 20mg/mL, and 5mg of that is 25 units
dead space in the needle hub is real and it is small