Partial dose because the pen has been discussed here with more heat than it deserves, mostly because two definitions have been in play the whole time.
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Practice · Administration · continued
A partial dose because the pen emptied mid-injection posts 91–120
This is a continuation of a long topic, addressed by post number rather than by page. Start at post 1 · go to the accepted answer.
t.karlsen, post #68: Fine by me. I had wanted a stronger conclusion and there is not one available. Go to post
Post #89 describes the usual case. This is about the unusual 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.
This is where my knowledge stops and I would rather mark the edge than blur it.
r.ilunga, post #89: Air in the syringe is a much smaller problem subcutaneously than the anxiety about it suggests, and it is still worth expelling because the bubble occupies volume you meant to be liquid. Go to post
Research-use-only preparations are not supplied with administration instructions because they are not supplied for administration. Anything in this subcategory describing technique is describing what members do, not what a manufacturer recommends.
A site rotation scheme that actually works: abdomen, outer thigh, back of arm, outer hip. Rotate through them in order, move a minimum 2 cm between consecutive sites, note the site with each dose. If a local reaction appears you have the history. If you rotate properly you will not get lipohypertrophy from overuse of one area.
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That is a cleaner way of putting what I was circling around.
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On post #92 — agreed on the reasoning, with one qualification.
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.
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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 confident version of this sentence would be wrong, so here is the hedged one.
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p.ostergaard, post #71: Note the site alongside the dose. If a local reaction appears three weeks later you will want to know where the previous four injections went. The reasoning is more useful than the number, which is why I have shown it. Go to post
Leak-back after withdrawal: a small amount of liquid on the skin after withdrawal is ordinary. Whether you lost a "meaningful" dose depends on concentration and your target dose, but some leak-back is universal and does not need to be treated as an error.
k.asante, post #94: A site rotation scheme that actually works: abdomen, outer thigh, back of arm, outer hip. Rotate through them in order, move a minimum 2 cm between consecutive sites, note the site with each dose. If a local reaction appears you have the history. If you rotate properly you will not get lipohypertrophy from overuse of one area. Go to post
A request rather than an answer: could whoever has the primary source for partial dose because the pen post it? I have seen the claim three times this month and each version had lost a qualifier.
Two sentences on partial dose because the pen and then I will stop, because the rest is speculation and the thread is better without mine.
What is documented is narrow. What is inferred from it is broad. The gap between them is where every argument here lives.
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On post #98 — agreed on the reasoning, with one qualification.
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.
That is the version I use. It may not be the version that is correct.
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Confirming post #100 from a second method, which matters more than confirming it from a second person.
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.
I am not the right person to answer the follow-up to this.
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w.novak, post #65: 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 disagreement above is smaller than it looks once the terms are fixed. Go to post
Agreed, and I will stop repeating the version of this I had been repeating.
b.frisk, post #100: A request rather than an answer: could whoever has the primary source for partial dose because the pen post it? I have seen the claim three times this month and each version had lost a qualifier. Go to post
Adding the measurement that post #103 says would settle it.
Reading this partial dose because the pen thread as someone who came in with a fixed view: the third and seventh replies moved me and the confident ones did not.
Post #102 describes the usual case. This is about the unusual one.
Air in the syringe is a much smaller problem subcutaneously than the anxiety about it suggests, and it is still worth expelling because the bubble occupies volume you meant to be liquid.
That has held every time I have looked, which is not the same as always.
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The version of partial dose because the pen that I was taught turned out to be a teaching simplification. Useful, and not true in the way I had assumed it was.
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t.lindqvist, post #7: Post #5 put the caveat in the right place and I want to underline it. Worth separating partial dose because the pen as a question about the compound from partial dose because the pen as a question about the documentation. They get answered by different people and only one of them is answerable here. Go to post
The arithmetic in post #108 is right; the assumption feeding it is the part to check.
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.
I would be glad to be shown a cleaner way of putting this.
Partial dose because the pen has a well-known answer and a correct answer, and the interesting work is establishing that they are the same. Nobody has done that here yet.
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h.espinoza, post #62: Leak-back after withdrawal: a small amount of liquid on the skin after withdrawal is ordinary. Whether you lost a "meaningful" dose depends on concentration and your target dose, but some leak-back is universal and does not need to be treated as an error. The step people skip is the one I have spelled out. Go to post
Where I part company with post #109, and it is a narrow parting.
Note the site alongside the dose. If a local reaction appears three weeks later you will want to know where the previous four injections went.
Two sources, same conclusion, and I could not rule out that one copied the other.
Wendelboe, post #38: A note on scope: what I am saying about partial dose because the pen applies to the case in the first post and I would not extend it further without checking. Go to post
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 would hold that lightly until someone with a larger sample weighs in.
Adding a reference point for partial dose because the pen. Mine is a single case, collected without controls, and I am posting the method alongside it so it can be discounted appropriately.
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s.kravchenko, post #52: I would put moderate confidence on the mainstream reading of partial dose because the pen and no more. That is not scepticism for its own sake; it is where the sourcing actually stops. Go to post
I had written a reply contradicting post #113 and deleted it. Here is what survived.
Letting a refrigerated preparation come to room temperature before injecting reduces the sting for most people. It is not a stability requirement, it is a comfort one, and the two get confused.
Confirming post #113 from a second method, which matters more than confirming it from a second person.
What I can speak to on partial dose because the pen is narrow, so I will keep it narrow rather than generalising from it. Beyond that boundary I do not know.
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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.
Adding it in case it saves somebody the afternoon it cost me.
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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.
For what it is worth, the same held on the two occasions I checked.
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j.teixeira, post #42: Adding the measurement that post #39 says would settle it. What I would tell a new member reading about partial dose because the pen for the first time: the confident posts are not the reliable ones, and the reliable ones are longer. Go to post
Agreed on partial dose because the pen, with one qualification that I think matters. The reasoning holds for the case as described. Change the starting assumption and it does not, and the starting assumption is the part nobody states.