Dead volume across syringe and needle combinations

On the subject in the title: Dead volume across syringe and needle combinations Working notes rather than a conclusion.

Something about dead volume across syringe does not reconcile and I would like a second pair of eyes before I decide which half is wrong.

Two sources, both reputable, giving figures that cannot both be right unless they are measuring different quantities. My suspicion is that they are, and I cannot see how.

That is the distinction I keep failing to hold on to. Written down now.

I would put moderate confidence on the mainstream reading of dead volume across syringe and no more. That is not scepticism for its own sake; it is where the sourcing actually stops.

Reusing a needle blunts it and there is no benefit to offset that. The second injection with the same needle is the one people describe as painful.

This is the version I would want a new member to read first.

If your calculated volume is under two graduations, choose a lower concentration rather than trying to read between marks. Precision comes from the preparation, not the eye.

Building on post #38 rather than restating it.

On dead volume across syringe, the part that usually goes wrong is that the question is asked as though it has one answer. It has a range, and the width of the range is the interesting bit.

If you can post the two or three numbers you are working from, several people here will check the arithmetic rather than argue about the conclusion.

Syringe barrel size: common sizes are 0.3 mL, 0.5 mL, and 1.0 mL. Smaller barrels are more legible for small doses. Larger barrels hold larger volumes. Choose based on your dose.

That reframing is the whole thing. The facts I already had.

Thank you — that answers what I came here to find out.