[Discussion] can we stop arguing about reconstitution until somebody posts a number
can we stop arguing about reconstitution until somebody posts a number — that is what I am asking, and I have already read the wiki twice. The failure modes I have actually seen posted here, in order of frequency. One: reconstituting at a different volume than intended and not writing it down, so the next draw is…
Working has to be shown on arithmetic posts. Added a note asking for it rather than removing this one.
Working has to be shown on arithmetic posts.
units_not_mg has the units point exactly right. They are a volume on the barrel and nothing else.
Aim the stream down the wall of the vial rather than into the cake. Reconstitution is a solubility problem, not a mixing problem, and mechanical shear does nothing helpful.
Correction: that gives 25 units, not what you have written. 20mg into 2mL is 10mg/mL and the division follows from there.
if the maths gives you a fraction of a unit, change the concentration
Is that a U-100 syringe? The barrel markings change the answer completely.
This. Showing the working is the fastest way for somebody else to spot the mistake.
Did the maths give you a whole number of units, or a fraction?
Spent 19 weeks confused about this until somebody drew the table for me. 5mg, 1mL, 5mg/mL, 5mg is 100 units. That is the whole thing.
What is written on the vial right now?
Reconstituted at 3mL when I meant to use a different volume. Caught it because the units looked wrong on the barrel. Now I write 6.67mg/mL on the glass before I put the cap back.
the number you write down is the number you will trust at 6am
Show the arithmetic — where did the unit figure come from?