This is a continuation of a long topic, addressed by post number rather than by page. Start at post 1.
The reason ten-fold dose error caught is hard to answer is that the obvious measurement and the relevant quantity are not the same thing, and substituting one for the other is silent.
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.
Coming back to post #90, because the follow-up matters more than the original answer.
Silicone coating on the barrel affects how smoothly the plunger moves and how a very slow injection feels. It is one reason two syringes at the same specification are not identical to use.
I would rather be precise about what I do not know than vague about what I do.
Reusing a needle blunts it and there is no benefit to offset that. The second injection with the same needle is the one people describe as painful.
Reporting the observation and leaving the explanation open deliberately.
Sharps containers are a legal requirement for disposal in several jurisdictions and a sensible precaution everywhere. A rigid sealed container is the minimum.
I had written a reply contradicting post #94 and deleted it. Here is what survived.
Drawing air into the vial before withdrawing liquid equalises the pressure and makes the draw easier. It is not required and it is why some people find a full vial harder to draw from than a half-empty one.
The arithmetic in post #97 is right; the assumption feeding it is the part to check.
Needle length for subcutaneous delivery is a question about tissue depth and injection angle together. Short needles at ninety degrees and longer ones at an angle reach comparable depths.
Written in the hope of being told what I have missed.
Graduation spacing is worth checking before you buy rather than after. Some 1 mL barrels are marked every two units and some every one, and that changes what doses you can read.
I am reporting what happened, not recommending it.
Insulin syringe graduations: U-100 syringes are marked in units where 100 units = 1 mL. Always confirm your syringe is U-100. Confusion between insulin units and milligrams is the most common syringe error.
The evidence for this is thinner than the way I have phrased it suggests.
Syringe barrel size: common sizes are 0.3 mL, 0.5 mL, and 1.0 mL. Smaller barrels are more legible for small doses. Larger barrels hold larger volumes. Choose based on your dose.
It is the sort of thing that seems obvious in retrospect and was not at the time.
What I would tell a new member reading about ten-fold dose error caught for the first time: the confident posts are not the reliable ones, and the reliable ones are longer.
On post #100 — agreed on the reasoning, with one qualification.
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.
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