U-100 and U-40 insulin syringes as measuring instruments. A U-100 syringe is graduated in insulin units where 100 units equals 1 mL, so one unit is 0.01 mL - the conversion that trips up more people here than any other single piece of arithmetic.
Details up front: a 0.3 mL insulin syringe · 40 mg · 2 mg/mL. I can do the algebra. I am not confident about the conversion factors. If there is a standard way to lay…
Conditions: 12 units · 5 mg/mL. I am trying to do this correctly the first time rather than learn it by getting it wrong. I have already made one mistake here that…
Concretely: semaglutide · 20 mg/mL. I want to decide this in advance so that I am not deciding it under pressure later. Assume I will follow the plan I write down, so…
The case in front of me: survodutide · 20 mg/mL. I want to decide this in advance so that I am not deciding it under pressure later. Assume I will follow the plan I…
The particulars: a 29G needle · 1 mg/mL. I would rather understand the derivation than memorise the outcome. Two people I asked gave two answers that differ by a…
Concretely: 20 units · 3.33 mg/mL. I am trying to do this correctly the first time rather than learn it by getting it wrong. I have already made one mistake here that…
Conditions: 10 mg · 0.5 mL. I want the working, not the result — I need to be able to redo it with different numbers. I care about the precision as well as the value…
Conditions: a U-40 insulin syringe · 5 mg/mL. I think I have a problem. I am not yet sure whether it is a real problem or a measurement artefact. I want to know…
Details up front: a U-100 insulin syringe · 10 mg · 2 mg/mL. This should be a straightforward calculation and I keep getting two different answers. The numbers are…
Numbers first: cagrilintide · 4 mg/mL. This is a planning question. I know what my options are; I do not know how to weigh them. What I want is the minimum viable…
Stated plainly: a low-dead-space syringe · 15 mg · 10 mg/mL. I have worked this out and I would like someone to find the error, because I suspect there is one. My…
Stated plainly: a low-dead-space syringe · 4 mg · 1 mg/mL. The units are where I keep going wrong, so please be explicit about them. I have sanity-checked the order…
Concretely: a 27G needle · 8 mg/mL. I want the working, not the result — I need to be able to redo it with different numbers. I care about the precision as well as…
What I have: a 0.3 mL insulin syringe · 2.5 mg · 8 mg/mL. This should be a straightforward calculation and I keep getting two different answers. The numbers are…
Details up front: 25 units · 4 mg/mL. I can find plenty of assertions about this and almost no reasoning, which is usually a sign that nobody has checked. Assume no…
Concretely: a 0.5 mL insulin syringe · 30 mg · 10 mg/mL. I want the working, not the result — I need to be able to redo it with different numbers. I care about the…
Conditions: a U-40 insulin syringe · 30 mg · 4 mg/mL. I want the working, not the result — I need to be able to redo it with different numbers. I care about the…
The particulars: a 31G needle · 1 mg/mL. I would like the arithmetic checked rather than the conclusion asserted. I have deliberately not used an online calculator…
For reference: 40 units · 1 mg/mL. I want a method I can write down and repeat, not a rule of thumb. I would rather over-engineer this than discover a problem later,…
Stated plainly: a U-40 insulin syringe · 4 mg · 1 mg/mL. The units are where I keep going wrong, so please be explicit about them. I have sanity-checked the order of…
The case in front of me: a 30G needle · 8 mg/mL. Please show the division. I want to check my own against yours. I would like the general form as well as the specific…
What I am working with: a low-dead-space syringe · 50 mg · 1 mg/mL. The units are where I keep going wrong, so please be explicit about them. I have sanity-checked…
The case in front of me: a 30G needle · 3.33 mg/mL. I want the working, not the result — I need to be able to redo it with different numbers. I care about the…
What I am working with: 5 mg · 1 mL. The units are where I keep going wrong, so please be explicit about them. I have sanity-checked the order of magnitude and it…
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