u/dilara_szabo

Started logging the cycle in the same sheet as the dose. Three months later the pattern was obvious and it had been invisible before.

Where in the cycle does this fall, if you are tracking it?

bacteriostatic water has the preservative, sterile water does not

This. Anything involving pregnancy or contraception goes to a clinician, and this board should keep saying so.

A report is useful here when it carries dates, the exact domain, what was requested, what arrived and what did not. Everything else is atmosphere.

the same dose can feel different at different points in the month

The arithmetic in full: concentration is mass over volume, so 10mg into 1mL gives 10mg/mL. A U-100 syringe is graduated at 100 units per millilitre, so 2mg is 2 divided by 10 millilitres, which is 20 units.

the review page nobody can find on any other site is a warning

do the arithmetic before you reconstitute, not while holding a syringe

ines_ekstrom has the units point exactly right. They are a volume on the barrel and nothing else.

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.