Injection site reactions — looking for input

NurseAsh_DET said:

Helpful tip for injection-site reactions needle anxiety: ice the injection site for 30 seconds before injecting.

That is right, and it stops being right at the edges. The general case is well behaved; the interesting cases in this thread are all at the boundary where the general case breaks.

If somebody has the primary source to hand I would rather cite it than paraphrase it.

Dr.SleepRoch said:

I see both sides of injection-site reactions in my clinical practice.

This answered a question I did not know how to ask. Sending this to two other people who asked me the same thing last week.

NurseAsh_DET said:

Helpful tip for injection-site reactions needle anxiety: ice the injection site for 30 seconds before injecting.

Filing a mild objection. Mild because I might be wrong; an objection because nobody has addressed the case that does not fit. The objection nobody has made: this only works if the measurement is doing what we assume it is doing, and that assumption has not been tested here.

The figures, for anyone assembling their own picture. Keep the original post as written when you update it, and add the correction underneath. An edited-away mistake is invisible to the next person who makes it.

Moderator note: the sourcing question belongs in the vendor section and has been split out. Carry on.