why does nobody talk about units
The title is the whole question — why does nobody talk about units — but here is why I am asking. 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 the same…
Why "more water" keeps confusing people, including me for a month.
The vial contains a fixed amount of peptide. Water changes nothing about that amount. What it changes is concentration, and concentration is the divisor between the dose you want and the volume you draw.
So doubling the water halves the concentration and doubles the units for the same dose. Nothing is diluted in any sense that matters; you are simply reading a bigger number off the same barrel. Pick the water volume that puts your usual dose on a whole number of units and life gets easier.
Same. I got this wrong once, caught it because the units looked absurd, and have written on every vial since.
Yes. Writing 10mg/mL on the vial takes four seconds and removes the entire class of error this board exists to fix.
I would not round that figure. At 10mg/mL a rounding error of two units is a real fraction of the intended amount.
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a U-100 syringe reads 100 units to the millilitre, every time
Correction: that gives 40 units, not what you have written. 5mg into 2mL is 2.5mg/mL and the division follows from there.