Posting this under the heading it deserves: Fixed versus detachable needles: the trade-offs Everything below is what sits behind that.
I was wrong about fixed versus detachable needles in a thread last spring and I would like to correct it publicly rather than quietly.
The error was in the units, which changed the conclusion by an order of magnitude. Setting out the corrected version, and the way I now check for that class of mistake.
Sharps disposal: needles and syringes should be disposed in a sharps container (a rigid, puncture-resistant container). Do not put them in regular trash. Many pharmacies accept filled sharps containers.
None of the above is medical advice and I am not qualified to give any.
That reframing is the whole thing. The facts I already had.
Post #31 describes the usual case. This is about the unusual one.
U-100 means the barrel is graduated for a solution containing one hundred units of insulin per millilitre. For anything that is not insulin, the units are simply hundredths of a millilitre.
Fixed versus detachable needles 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.
Dead volume: residual liquid in the hub and needle after withdrawal. Typical residual is 0.01 to 0.02 mL for an insulin syringe with a fixed needle. Accounting for it matters if precision matters.
Read the full topic (122 posts)
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A ten-fold dose error caught before injection — one year on
On the subject in the title: A ten-fold dose error caught before injection — one year on Working notes rather than a conclusion. Two things I would like separated before anyone answers on ten-fold dose error…
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+151 | 157 | 9.4k | 12mo |
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Reading a syringe in poor light, and how to avoid needing to
Reading a syringe in poor light, and how to avoid needing to Writing it up because I had to work it out twice and would rather nobody else did. The question about reading a syringe that I actually want…
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2 | 22k | just now | |
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[2026 update] 0.3 mL versus 0.5 mL versus 1 mL barrels: resolution matters
On the subject in the title: 0.3 mL versus 0.5 mL versus 1 mL barrels: resolution matters Working notes rather than a conclusion. A follow-up question about 0.3 ml versus 0.5 ml that I did not know to ask the…
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+108 | 124 | 27k | 2mo |
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Reading U-100 graduations, with a conversion table — what changed since
Reading U-100 graduations, with a conversion table — what changed since Writing it up because I had to work it out twice and would rather nobody else did. What changes if the standard account of Reading U-100…
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2 | 10k | 2mo | |
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Gauge and length selection for subcutaneous injection
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+50 | 55 | 1.3k | 8mo |
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Regression to the mean in progress reports
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+30 | 34 | 49k | 12mo |
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Reading a syringe in poor light, and how to avoid needing to — what changed since
Posting this under the heading it deserves: Reading a syringe in poor light, and how to avoid needing to — what changed since Everything below is what sits behind that. What changes if the standard account of…
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+3 | 7 | 27k | 27d |
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Follow-up: Where the four-week escalation interval comes from, and what it is not
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+131 | 147 | 47k | 18mo |
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How to disagree with an answer you were given, well
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+9 | 13 | 1.6k | 1mo |
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Converting between mg/mL and units per dose, both directions — the long version
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+110 | 132 | 1.7k | 3mo |