This is a continuation of a long topic, addressed by post number rather than by page. Start at post 1.
On post #57 — agreed on the reasoning, with one qualification.
Preservative effectiveness is tested against a defined microbial challenge under defined conditions. It is not a licence to treat an entered vial as sterile indefinitely, and no supplier claims otherwise.
Decimal-point error is one of those subjects where the general answer and the answer for a specific case diverge, and the thread will go in circles until someone says which one is being asked for.
Do not shake. Swirl, or leave it. Vigorous agitation introduces air and shear, and neither helps a peptide go into solution any faster than patience does.
If anyone can point at the primary source I would be grateful.
Post #61 describes the usual case. This is about the unusual one.
Where I have landed on decimal-point error, having got it wrong once in public: the direction is clear, the magnitude is not, and anyone quoting a precise magnitude has borrowed it from somewhere that did not measure it.
Adding the measurement that post #65 says would settle it.
Worth separating decimal-point error as a question about the compound from decimal-point error as a question about the documentation. They get answered by different people and only one of them is answerable here.
Preservative effectiveness is tested against a defined microbial challenge under defined conditions. It is not a licence to treat an entered vial as sterile indefinitely, and no supplier claims otherwise.
That is the shape of it. The detail is where I would expect to be corrected.
The question underneath decimal-point error is usually "how would I tell?" rather than "what is true?", and that one has a method attached to it.
Write down what you would expect to see under each hypothesis before you collect anything. If they predict the same observation, collecting it will not help.
Taking post #69 at face value and following it one step further.
I would put moderate confidence on the mainstream reading of decimal-point error and no more. That is not scepticism for its own sake; it is where the sourcing actually stops.
Sensible. I would want the same detail before I acted on it either.
Answering the question post #70 raises rather than the one it answers.
A definition problem is doing most of the work in this decimal-point error discussion. Once the term is pinned down I suspect the disagreement mostly goes away and what is left is small.
Post #72 is the version of this I will quote in future. One addition.
Preservative effectiveness is tested against a defined microbial challenge under defined conditions. It is not a licence to treat an entered vial as sterile indefinitely, and no supplier claims otherwise.
Narrowing post #72, because the general version has more than one answer.
Decimal-point error: I would want to see the raw numbers rather than the summary before agreeing. Summaries lose exactly the information that would settle this.
Everything in post #75 holds. The case it does not cover is the one I have.
Do not shake. Swirl, or leave it. Vigorous agitation introduces air and shear, and neither helps a peptide go into solution any faster than patience does.
The evidence for this is thinner than the way I have phrased it suggests.
Preservative effectiveness is tested against a defined microbial challenge under defined conditions. It is not a licence to treat an entered vial as sterile indefinitely, and no supplier claims otherwise.
That has been true for the cases I have seen and I have not seen many.
The decimal-point error: computing 5 mg / 2 mL as 0.25 mg/mL instead of 2.5 mg/mL is the most common arithmetic error in this subcategory. The habit that catches it: writing the units in every step of the calculation.
Anyone who has looked at this more carefully, please correct the record.
Where I part company with post #80, and it is a narrow parting.
Do not shake. Swirl, or leave it. Vigorous agitation introduces air and shear, and neither helps a peptide go into solution any faster than patience does.
Not a conclusion. A place to stand while looking for one.
Post #80 is the version of this I will quote in future. One addition.
The version of decimal-point error that I was taught turned out to be a teaching simplification. Useful, and not true in the way I had assumed it was.
Whatever the answer on decimal-point error turns out to be, the method for getting there is the same: state the assumption, do the arithmetic in public, invite the correction.
The decimal-point error: computing 5 mg / 2 mL as 0.25 mg/mL instead of 2.5 mg/mL is the most common arithmetic error in this subcategory. The habit that catches it: writing the units in every step of the calculation.
If anyone has run this properly I would rather read that than my own guess.
Confirming post #83 from a second method, which matters more than confirming it from a second person.
The number people quote for decimal-point error is a central estimate presented without its interval, and the interval is wide enough that the estimate is nearly uninformative on its own.
Write the reconstitution date and the concentration on the vial. Not on a note, on the vial. Every account here of a dosing error involving the wrong concentration involves a vial with nothing written on it.
That is a cleaner way of putting what I was circling around.
What I would check first on decimal-point error is whether the thing being measured moved or whether the way of measuring it moved. Those look identical in a graph.
Filing a mild objection to the consensus on decimal-point error. Mild because I might be wrong; an objection because nobody has addressed the case that does not fit.