This is a continuation of a long topic, addressed by post number rather than by page. Start at post 1.
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.
The number is defensible. The precision I gave it is not.
Small methodological point on angle of injection: repeating a measurement is cheap and resolves most of what is being argued about here at no cost to anyone.
This follows post #60 rather than contradicting it.
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.
Worth separating two things that post #62 runs together.
Subcutaneous injection into abdominal tissue, thigh or upper arm is what the licensed labelling in this class describes, and the published comparisons found the differences in exposure between those sites small.
Narrowing post #64, because the general version has more than one answer.
Having read the whole angle of injection thread before replying: the question in the first post has not actually been answered yet, and three of us have answered a nearby one instead.
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.
I am confident about the direction and much less about the magnitude.
Adding a data point of agreement rather than a data point.
Post #66 and I disagree about the size of the effect, not about the direction.
Where I would push back on the angle of injection consensus is the confidence, not the direction. The direction looks right. The confidence is borrowed.
Confirming post #68 from a second method, which matters more than confirming it from a second person.
Subcutaneous injection into abdominal tissue, thigh or upper arm is what the licensed labelling in this class describes, and the published comparisons found the differences in exposure between those sites small.
I had written a reply contradicting post #66 and deleted it. Here is what survived.
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.
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 bit of angle of injection that nobody enjoys is that the answer changes depending on what you are trying to decide with it. Say what the decision is and the thread will converge.
Post #69 and I disagree about the size of the effect, not about the direction.
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.
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.
That is the distinction I keep failing to hold on to. Written down now.
I had written a reply contradicting post #77 and deleted it. Here is what survived.
Pinching a fold is useful for lean tissue and unnecessary elsewhere. The point is to keep the needle out of muscle, and whether you need to depends on the site and on you.
Not a conclusion. A place to stand while looking for one.
Confirming post #77 from a second method, which matters more than confirming it from a second person.
The single most common technique error described here is drawing to the wrong graduation because the barrel was read at an angle. Read it straight on, at eye level, every time.
Building on post #79 rather than restating it.
Cold solution and stinging: warming the vial in your hands for a minute before injection reduces the stinging sensation substantially. This is the simplest thing to try if injections are uncomfortable.
Air bubbles in a subcutaneous injection: the honest risk assessment is low. Tiny air bubbles in subcutaneous tissue do not behave like an air embolism in a blood vessel. A few air bubbles are not a reason to restart the entire injection.
Worth saying I have only my own numbers here, and n is small.
A new needle for each injection is not fussiness. A needle blunts on first use and a blunted needle is the reason the second injection hurts more than the first.
The mechanism is plausible, which is not the same as established.
Alcohol swabbing and letting the site dry is the whole of the preparation for a subcutaneous injection into intact skin. Injecting before it dries is what stings.
I would be glad to be shown a cleaner way of putting this.
I had read the opposite somewhere and cannot now find where, which tells me something.
Post #84 describes the usual case. This is about the unusual one.
Angle of injection is worth one more sentence than it usually gets, and the sentence is the one about how the number was arrived at.
What I want from this angle of injection thread is the list of things that would need to be true for the claim to hold. If we can write that list, we can check it.