Pen dose counters: what a click does and does not guarantee — setting out what I have, and where I think it stops being reliable.
Reading back through what has been written here about Pen dose counters, three questions come up every time and only one has ever been answered properly.
Listing all three, with what I think the state of the answer is for each, so the thread can start further along than the last one did.
Building on the opening post rather than restating it.
A pen taken straight from the refrigerator is uncomfortable to inject for the same reason a cold syringe is. Room temperature for a short while first is the standard advice.
A single observation, in a thread that deserves better than single observations.
Disposal of a used pen is a sharps question even where the needle is retracted, and local rules vary more than people expect.
A pen that will not dial to the intended dose is usually telling you the cartridge does not contain enough for it. That is a designed behaviour rather than a fault.
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Revisiting: Drawing from a pen cartridge with a syringe: how the risk profile changes
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2 | 18k | 6h | |
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Priming a pen and whether the primed volume is wasted — one year on
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Pen mechanics when the cartridge is nearly empty — does this still hold?
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+37 | 47 | 61k | 6mo |
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Storing a pen in use versus a pen unopened — what changed since
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2 | 206 | 15mo | |
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Why a pen's dose steps are fixed and what that costs you
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4 | 2.5k | 23h |
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Reading a syringe in poor light, and how to avoid needing to — what changed since
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+3 | 7 | 27k | 27d |
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Gauge and length selection for subcutaneous injection
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+50 | 55 | 1.3k | 8mo |
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Second pass at: Leak-back after withdrawal and whether you lost a meaningful dose
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+18 | 22 | 2k | 25d |
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Needle changes between doses on a reusable pen — does this still hold?
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+1 | 5 | 38k | 13mo |
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Dead volume across syringe and needle combinations
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+72 | 80 | 28k | 5mo |