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Practice › Administration subcutaneous injection injection site rotation needle gauge & length

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KLindqvistTL4 Moderator22 Jun 2025#1

Community wiki post. Any member at trust level 3 or above can edit this post; every edit is recorded. Last edited by hana.sato on 6 Jan 2026.

10 Jul 2025 — KLindqvist: Removed a claim that the cited source did not support.
6 Sep 2025 — mira.patel: Replaced an unsourced figure with the published one and cited it.
6 Jan 2026 — hana.sato: Added the worked example and a unit label to the table header.

Editors: KLindqvist, mira.patel, hana.sato

Staff post. Actions described here are recorded in the public moderation log and may be challenged in Meta.

Technique, needle selection, site rotation, injection discomfort, and what to do about a missed or partial dose.

This post is a community wiki: any member at trust level 3 or above can edit it, and every edit is recorded with its author and a note. If the scope described here has drifted from what actually gets posted, edit it rather than starting a topic about it.

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Questions specific to administration, with the units and the context stated.
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Before posting, it is worth checking the documentation commons and this category's tag pages. A great deal of what gets asked here has a maintained answer with a review date on it, which is more reliable than a two-year-old reply.

0 likes 13mo

dr_okonkwoTL4 Moderator30 Jun 2025#2

Staff post. Actions described here are recorded in the public moderation log and may be challenged in Meta.

Moderation notes for this category, so that nothing about how it is run is a surprise.

Topics get moved into and out of here regularly. A move is not a judgement — the category tree is not obvious from outside and putting a question in the wrong place is expected. When I move something I say so in the topic and the action appears in the public log with the guideline cited.

The two guidelines that come up most often in this category are R2, on supplying a source when asked, and R7, on category placement. Neither is used punitively.

2 likes 13mo

j.solbergTL27 Jul 2025#3

As a member rather than staff: the most useful thing I did when I started reading this category was to work through the tag pages rather than the topic list. The topic list shows you what is recent. The tags show you what is settled.

13 likes 13mo

LundqvistTL2Member12 Jul 2025#4

Suggestion for the wiki post above: it would be worth linking the two or three most-referenced topics in this category directly, since new members reliably ask for exactly those. Happy to make the edit myself if nobody objects, with a revision note.

28 likes 13mo

a.reyesTL4 Admin17 Jul 2025#5

dr_okonkwo, post #2: Moderation notes for this category, so that nothing about how it is run is a surprise. Topics get moved into and out of here regularly. A move is not a judgement — the category tree is not obvious from outside and putting a question in the wrong place is expected. When I move something I say so in the topic and the action appears in the… 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.

0 likes in reply to #2 12mo

k.dahlbergTL222 Jul 2025#6

j.solberg, post #3: As a member rather than staff: the most useful thing I did when I started reading this category was to work through the tag pages rather than the topic list. The topic list shows you what is recent. The tags show you what is settled. Go to post

Sharps disposal is the part of this that gets least attention and is genuinely a legal question in some jurisdictions rather than a matter of preference.

This is the sort of thing that ought to be settled and apparently is not.

5 likes in reply to #3 12mo

owen.bradyTL4 Moderator27 Jul 2025#7

Following this. I have the same question and no better information than the first post.

19 likes 12mo

r.serranoTL231 Jul 2025#8

I read post #6 twice before replying, because I had assumed the opposite.

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.

Two sources, same conclusion, and I could not rule out that one copied the other.

0 likes 12mo

microgramsTL2Regular5 Aug 2025#9

Rotate on a fixed sequence rather than choosing each week. A sequence you follow beats a scheme you improvise, and it produces a record you can read back.

I would want to see it done twice before believing it once.

29 likes 12mo

a.adeyemiTL29 Aug 2025#10

micrograms, post #9: Rotate on a fixed sequence rather than choosing each week. A sequence you follow beats a scheme you improvise, and it produces a record you can read back. I would want to see it done twice before believing it once. Go to post

On post #6 — 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.

A partial answer, offered because a partial answer beats none.

0 likes in reply to #9 12mo

This topic was referenced in

Cold solution and stinging: the simplest fixPractice › Administration · 39 replies
Drawing up with one needle and injecting with anotherPractice › Administration · 5 replies
[2026 update] Cold solution and stinging: the simplest fixPractice › Administration · 10 replies

This topic was closed 60 days after the last reply. Closing is automatic for quiet topics so that a settled answer does not collect new questions underneath it. If you have a follow-up, open a new topic and link back to this one — that keeps both readable and gives your question its own title.

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