why does nobody talk about concentration
why does nobody talk about concentration. Searched first, found three threads that contradict each other, hence the post.
Wrote the date on the vial as well as the concentration after losing track of which one was opened first.
Shook the first vial because nobody told me not to. It was fine, but I have swirled every one since.
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 every draw.
Research-use-only material is not approved for human use and nothing here should be read as a recommendation to use it.
best — the order this archive was captured in
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.
Corrected the concentration in the title, which contradicted the body. Nothing else touched.
the powder cake sits at the bottom, the volume you add is the volume that counts
Agreed — units are volume. Once that lands, the rest of the arithmetic is one division.
Pushback on the syringe advice: a U-100 barrel reads units of volume. Calling them "doses" is how the confusion starts.
Agreed on the swirl. There is no reason to shake it and a good reason not to.
Started reconstituting everything to a round concentration and the six-in-the-morning error rate went to zero.
a U-100 syringe reads 100 units to the millilitre, every time
Are you accounting for the powder volume, or is that where the confusion is?
Did the maths give you a whole number of units, or a fraction?
What concentration did you actually reconstitute at, rather than what did you intend to?
Show the arithmetic — where did the unit figure come from?
Show the arithmetic — where did the unit figure come from?
Adding one thing — put the date on the label too. Concentration plus date and you can never mix two vials up.
Adding one thing — put the date on the label too.
Right, and the arithmetic behind it: 30mg in 3mL is 10mg/mL, so 0.5mg is 5 units.
label the vial with the date as well as the concentration
more water is not more drug, it is the same drug in a bigger volume
Is that a U-100 syringe? The barrel markings change the answer completely.
Same. I got this wrong once, caught it because the units looked absurd, and have written on every vial since.
units are a volume on a U-100 syringe, not a dose
How many mg in the vial and how many mL are you adding?
- 1Are you accounting for the powder volume, or is that where the confusion is?11 comments in this branch · started by u/yusuf_achebe