Pinch or no pinch, and how needle length changes the answer posts 91–120
This is a continuation of a long topic, addressed by post number rather than by page. Start at post 1.
If you have to inject at a different time of day than usual, that is a much smaller perturbation than it feels for a weekly compound with a week-long half-life.
The arithmetic on pinch is the easy part and it is where the errors are, which is an uncomfortable combination. Show your working and someone will catch it.
Coming back to post #92, because the follow-up matters more than the original answer.
Needle length matters less than angle for subcutaneous delivery in most people. A short needle at ninety degrees and a longer one at forty-five put the material in roughly the same place.
Written in the hope of being told what I have missed.
Picking up post #94: that is the part I would want checked first.
Injecting into an area that has become firm: lipohypertrophy — thickened fatty tissue from repeated injection in one area — changes local tissue absorption. Avoid injecting into areas that are noticeably firm or lumpy and allow those areas to recover for at least a few months.
I would want the raw data before agreeing with my own summary of it.
On post #92 — agreed on the reasoning, with one qualification.
I read the earlier replies on pinch twice before writing this, because I had assumed the opposite and wanted to be sure I was disagreeing with what was said rather than what I expected.
Sensible. I would want the same detail before I acted on it either.
A note on how pinch gets discussed rather than on pinch itself: the confident posts get the replies and the careful ones get ignored, and the careful ones have been right more often.
Bleeding at the site is common and unremarkable at these needle gauges. Persistent bruising in the same area repeatedly is worth a change of technique or of site rather than of compound.
I would rather post the uncertainty than round it away.
Post #100 is the version of this I will quote in future. One addition.
Pinch is a question about a distribution, not about a value, and treating it as a value is what produces the confident wrong answers.
Leaving the needle in for a couple of seconds after depressing the plunger reduces leakage at the site. It costs nothing and it is the fix for the "some came back out" question.
Confirming post #103 from a second method, which matters more than confirming it from a second person.
Pinch or no pinch: the decision depends on needle length and on your own anatomy. A longer needle (8 mm and up) reaches subcutaneous tissue easily without a pinch. A shorter needle (4-6 mm) is safer with a gentle pinch. The pinch size matters less than people think; the injection angle matters more.
That is the honest state of it as of this week.
I had written a reply contradicting post #102 and deleted it. Here is what survived.
Genuine question rather than a rhetorical one: has anyone here actually observed pinch, as opposed to read about it? The thread is long and I cannot tell.
Collapsed as off-topic by two members at trust level 3 or above
Adding a reference point for pinch. Mine is a single case, collected without controls, and I am posting the method alongside it so it can be discounted appropriately.
Drawing up with one needle and injecting with another: a reasonable practice if you have extra needles. Fresh needle for injection reduces tissue drag and can decrease discomfort. Not necessary, but not harmful either.
Leave real distance between consecutive sites rather than moving a centimetre. Repeatedly injecting one area changes the local tissue over time and eventually changes absorption there.
Bleeding at the injection site: normal and usually minimal. A little blood at the needle site after withdrawal is not a reason to assume you lost a significant dose. The needle passed through tissue and there is a small amount of bleeding in the tract.
That much is documented. The rest is how I have interpreted it.
Source for the pinch figure, since it was asked for. It is in the discussion rather than the abstract, which is why the version circulating is stronger than the paper is.
Reading the surrounding paragraph is worth the two minutes. The authors are more careful than their summarisers.
Post #109 is right about the mechanism and I think understates the practical bit.
A request rather than an answer: could whoever has the primary source for pinch post it? I have seen the claim three times this month and each version had lost a qualifier.
Collapsed as off-topic by two members at trust level 3 or above
Worth separating two things that post #109 runs together.
Drawing up with one needle and injecting with another: a reasonable practice if you have extra needles. Fresh needle for injection reduces tissue drag and can decrease discomfort. Not necessary, but not harmful either.
I have separated what I observed from what I concluded, which does not always happen.
If you have to inject at a different time of day than usual, that is a much smaller perturbation than it feels for a weekly compound with a week-long half-life.
Noted, and thank you for writing it out rather than summarising it.
Confirming post #114 from a second method, which matters more than confirming it from a second person.
I changed my mind about pinch after someone here asked me for the source and I could not produce one. That is worth saying out loud because it is the ordinary way it happens.
Injecting into an area that has become firm: lipohypertrophy — thickened fatty tissue from repeated injection in one area — changes local tissue absorption. Avoid injecting into areas that are noticeably firm or lumpy and allow those areas to recover for at least a few months.
Angle of injection: 90 degrees into pinched tissue ensures subcutaneous placement. It is not always necessary and shallower angles can work, but 90 degrees into a small pinch is the safest technique to learn first.
Leaving the needle in for a couple of seconds after depressing the plunger reduces leakage at the site. It costs nothing and it is the fix for the "some came back out" question.
Same conclusion as the reply above, reached differently, which is mildly reassuring.
Before the thread moves on from pinch — what is the sample size behind the claim? I am not being difficult; I have seen the same figure quoted from an n of four and from an n of four hundred.