A ten-fold dose error caught before injection — setting out what I have, and where I think it stops being reliable.
Trying to work out what would count as evidence on ten-fold dose error caught, before collecting any. This is the part I usually skip and it is the part that makes the rest useful.
If two explanations predict the same observation, observing it does not help. So: what observation would separate them?
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.
Post #3 answers the question as asked. The question underneath it is different.
Two claims get bundled together under ten-fold dose error caught and they need separating. The descriptive one — this is what was observed — is usually well supported. The causal one — this is why — usually is not.
Almost every disagreement in threads like this one dissolves once you say which of the two you are making.
A detachable luer needle plus hub can retain enough volume to matter. Whether it matters to you depends on your dose, and the arithmetic is worth doing once.
Aspirating before injection: for subcutaneous injection, aspirating (pulling back on the plunger to check for blood) is not necessary and is sometimes discouraged because it is associated with more discomfort. Subcutaneous injection without aspiration is standard practice.
That is clearer than the version I had in my head. Thank you.
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.
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.
Speaking for myself and not for anyone else who has posted here.
Nothing to add, except that this is the answer I would give if asked.
Post #10 put the caveat in the right place and I want to underline it.
Needle length: typical lengths for subcutaneous injection are 4-6 mm (short), 8 mm (standard), or 10-12 mm (longer). Longer needles are needed for deeper tissue or if you have abdominal adiposity.
Post #13 answers the question as asked. The question underneath it is different.
Sharps containers are a legal requirement for disposal in several jurisdictions and a sensible precaution everywhere. A rigid sealed container is the minimum.
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.
A weak preference rather than a position.
Reading this ten-fold dose error caught thread as someone who came in with a fixed view: the third and seventh replies moved me and the confident ones did not.
Marking my place. If it changes for me I will come back and say so.
Everything in post #20 holds. The case it does not cover is the one I have.
A note on scope: what I am saying about ten-fold dose error caught applies to the case in the first post and I would not extend it further without checking.
Useful. I had the fact and not the reason, which turns out to be the important half.
Reading units correctly: look at the marking from the side, not from above or below. The bottom of the plunger tip is the reading. Parallax error (wrong angle) is a source of dosing error.
The part I am sure of is shorter than the part I have written.
Distinguishing three things in the ten-fold dose error caught discussion that keep getting used interchangeably: the observation, the proposed mechanism, and the recommendation that gets attached to both.
An update on my earlier ten-fold dose error caught post: the pattern held for another six weeks and then stopped, which I did not predict and cannot explain.
Needle gauge: smaller numbers (30G) are finer and less painful. Larger numbers (25G) are courser. For subcutaneous injection, 27-30G is typical. Finer needles take longer to draw up but hurt less.
Nothing above should be read as advice about what anyone else should do.
What would change my mind on ten-fold dose error caught is a second dataset collected by someone with no stake in the first. Until then I hold it loosely and I would rather say so than pretend to more.