A log row that says "12 units" is worthless six weeks later if you have re-mixed at a different concentration since. Record the date and time, the concentration in mg/mL, the dose in both mg and units, the vial lot, and the injection site. When you change a dose, record the date of the change and leave the old rows alone. A step change with a date next to it is the only thing that lets you read a pattern out of a log afterwards. The dose tracking tool I use keeps the mixing numbers attached to each logged dose for exactly that reason.
