On the subject in the title: Pinch or no pinch, and how needle length changes the answer — the long version Working notes rather than a conclusion.
A narrow question about Pinch, deliberately narrow, because the broad version has been asked here four times and produced four long threads and no answer.
One question, stated units, stated method, and what I have already ruled out.
Answering the question the opening post raises rather than the one it answers.
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.
Seconded. It reads as careful rather than confident, which is the right register.
Where the Pinch reasoning breaks down for me is the step from the group result to the individual case. That step is almost never argued for.
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.
Caveat: everything above assumes the paperwork is what it says it is.
Everything in post #4 holds. The case it does not cover is the one I have.
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.
I am confident about the direction and much less about the magnitude.
The strongest argument against my own position on Pinch, stated as well as I can state it, since nobody else has yet.
Injection discomfort: comes from needle gauge (finer = less discomfort), volume (smaller = less discomfort), temperature (room temperature or warmed is less uncomfortable than cold), and technique (smooth, purposeful injection is less uncomfortable than hesitant). All four are under your control.
The strength of my opinion here exceeds the strength of my evidence.
An honest declaration on Pinch: I have a prior here and it is strong enough that you should weight what I say downward. Stating it rather than hiding it.
Pinch is worth one more sentence than it usually gets, and the sentence is the one about how the number was arrived at.
I read post #7 twice before replying, because I had assumed the opposite.
A genuinely late dose: the labelling generally says that if the next dose is more than a couple of days away, take it as soon as you notice. If the next dose is close, skip it and resume the schedule. The reasoning follows from the long half-life; you are perturbing a slowly moving average.
Reading it back, the second half matters more than the first.
Pinch is well covered in the tag pages, and the older discussions are better than the recent ones because they were argued out properly. Worth twenty minutes before adding to this one.
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.
A partial answer, offered because a partial answer beats none.
My experience of Pinch contradicts the reply above. I am posting it as a data point rather than as a refutation, because one person's experience is exactly that.
I will take the caveat as seriously as the claim, which is the point of putting it there.
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.
Picking up post #15: that is the part I would want checked first.
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.
I have no financial interest in anything named in this thread and I want to say so before I comment on Pinch, because it is the sort of subject where it matters.
The arithmetic in post #19 is right; the assumption feeding it is the part to check.
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.
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.
That is a description of practice, not a recommendation of it.
Where I part company with post #18, and it is a narrow parting.
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.
It is one reading of the data and not the only reasonable one.
Pinch would be much easier to settle if anyone reported the denominator. Almost nobody reports the denominator.
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 most useful thing anyone has posted about Pinch in this category was a table of what had been measured and by whom. That is what I would want again.
Nothing in this subcategory is medical advice and none of it is a substitute for a demonstration from somebody qualified to give one, which most prescribers will do without being asked twice.
Adding a source would improve this post and I do not have one to hand.
Adding the measurement that post #24 says would settle it.
A note on scope: what I am saying about Pinch applies to the case in the first post and I would not extend it further without checking.
Right — I had this wrong and I am glad to have read it before it mattered.
Trying to state the Pinch position in a way that someone who disagrees would recognise as fair, because I do not think the version in this thread passes that test.