Pen mechanics when the cartridge is nearly empty — does this still hold?

Asking directly, because I could not find a straight answer: Pen mechanics when the cartridge is nearly empty — does this still hold?

Pen mechanics — I have the observation and I do not trust my interpretation of it, so I am posting the observation and holding the interpretation back.

Numbers, method and the conditions under which they were collected are below. Interpret them however they warrant.

Picking up post #2: that is the part I would want checked first.

The instruction leaflet for a licensed pen is a genuinely good technical document and is almost never read past the first page. It answers most of what gets asked here.

The click count on a dialled pen is a mechanical property of that pen and is not a universal unit. Counting clicks across two different devices is not a conversion.

If that reads as pedantic, it is, and it has saved me twice.

The arithmetic in post #20 is right; the assumption feeding it is the part to check.

Comparing cost per milligram between a pen and a vial ignores wastage, dead volume and the number of doses actually obtainable. Cost per delivered dose at your dose is the comparison that survives.

That is the shape of it. The detail is where I would expect to be corrected.

Post #26 and I disagree about the size of the effect, not about the direction.

Pen confusion between compounds: if you are using multiple pens or alternating pens, confirming you have the correct pen before injection prevents administration errors. Check the label every time.

I would treat that as a working assumption and revisit it.

Needle installation: some pens require a fresh needle for each injection; others have a single needle that stays attached. Check the design of your pen.

This follows post #41 rather than contradicting it.

Storage after first use: most pens can be stored at room temperature after first use, even if unrefrigerated, for a limited time (often 28 days). Check your specific pen's labelling.