[PSA] your bac water is fine, your fridge door is not
your bac water is fine, your fridge door is not. That is the post. The justification is underneath. Asked SGN what volume they reconstitute to for their own stability testing and they answered in one line. Useful thing to know. Started reconstituting everything to a round concentration and the six-in-the-morning…
The arithmetic in full: concentration is mass over volume, so 15mg into 1mL gives 15mg/mL. A U-100 syringe is graduated at 100 units per millilitre, so 0.75mg is 0.75 divided by 15 millilitres, which is 5 units.
I keep a laminated card in the drawer with the arithmetic on it. Looks ridiculous. Has never once let me draw the wrong volume.
Agreed on the swirl. There is no reason to shake it and a good reason not to.
Bacteriostatic water contains benzyl alcohol as a preservative, which is what makes repeated entry into the same vial reasonable. Plain sterile water has no preservative.
I would not round that figure. At 5mg/mL a rounding error of two units is a real fraction of the intended amount.
I keep a laminated card in the drawer with the arithmetic on it.
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.
This is the sentence that makes the rest unnecessary. Write it on the vial and the problem is gone.
a U-100 syringe reads 100 units to the millilitre, every time
aim the stream at the glass wall, not at the cake