A ten-fold dose error caught before injection — one year on posts 61–90

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.

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.

Saving this. It is the version I will quote when the question comes round again.

Ten-fold dose error caught was covered in the wiki last year and the page has a review date on it, which is a better starting point than my memory of a thread.

Buying a box of the wrong barrel size is the most common regret described in this subcategory, and the reason is nearly always that the dose was decided after the syringes.

Post #78 is the version of this I will quote in future. One addition.

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.

I would hold that lightly until someone with a larger sample weighs in.

This follows post #78 rather than contradicting it.

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.

Not disagreeing with anyone above, just adding the bit I keep having to look up.

Worth separating two things that post #80 runs together.

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.

The uncertainty is in the assumption, not in the calculation.

Adding what did not work for me on ten-fold dose error caught, since the failures never get written up and they are half the useful information.

That matches what I have seen, for whatever a single anecdote is worth.

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.

This has been discussed before and I could not find the thread, so, again.

On post #85 — agreed on the reasoning, with one qualification.

I have three months of notes on ten-fold dose error caught and the honest summary is that the trend is real and the week-to-week numbers are noise. I nearly drew the opposite conclusion from the first fortnight.

Post #86 is right about the mechanism and I think understates the practical bit.

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.

Reading it again, the caveat matters more than the finding.

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.

Sharps containers are a legal requirement for disposal in several jurisdictions and a sensible precaution everywhere. A rigid sealed container is the minimum.

If you are new and reading this thread for the answer to ten-fold dose error caught: the answer is conditional, the conditions are in the third reply, and the rest of the thread is worth skipping.