This is a continuation of a long topic, addressed by post number rather than by page. Start at post 1.
Taking post #30 at face value and following it one step further.
The reason bring a laboratory 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.
Bringing the actual numbers with intervals to an appointment is far more useful than describing them, and clinicians here consistently say so.
I read post #32 twice before replying, because I had assumed the opposite.
A definition problem is doing most of the work in this bring a laboratory discussion. Once the term is pinned down I suspect the disagreement mostly goes away and what is left is small.
What I would check first on bring a laboratory is whether the thing being measured moved or whether the way of measuring it moved. Those look identical in a graph.
I will take the caveat as seriously as the claim, which is the point of putting it there.
Coming back to post #36, because the follow-up matters more than the original answer.
Bring a laboratory 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.
The number people quote for bring a laboratory is a central estimate presented without its interval, and the interval is wide enough that the estimate is nearly uninformative on its own.
Noted, and thank you for writing it out rather than summarising it.
Where I part company with post #38, and it is a narrow parting.
Repeat before acting is standard practice for an isolated abnormal result on most analytes, and it is standard for a reason.
Not the whole picture, but the part of it I can speak to.
The most useful thing this subcategory does is help people tell an interesting result from an uninteresting one before booking an appointment about it.
What I would tell a new member reading about bring a laboratory for the first time: the confident posts are not the reliable ones, and the reliable ones are longer.
Time of day: some biomarkers vary across the day. Cortisol in the morning differs from cortisol in the evening. Comparing results from different times of day is comparing things that are not the same.
That is where I would start, not where I would stop.
Sample handling before analysis affects several analytes, and a haemolysed sample produces predictable artefacts that a laboratory will usually comment on.
Post #49 is right about the mechanism and I think understates the practical bit.
The useful distinction on bring a laboratory is between what was measured and what was inferred from it. Both end up in the same sentence and only one of them has error bars.
Post #51 and I disagree about the size of the effect, not about the direction.
Time of day: some biomarkers vary across the day. Cortisol in the morning differs from cortisol in the evening. Comparing results from different times of day is comparing things that are not the same.
Worth reading the earlier posts in this thread before acting on mine.
That is a cleaner way of putting what I was circling around.
Repeat before acting is standard practice for an isolated abnormal result on most analytes, and it is standard for a reason.
Post #56 answers the question as asked. The question underneath it is different.
A trend needs at least three points to be a trend. Two points are a line and a line through noise is still a line.
The mechanism is plausible, which is not the same as established.
I read post #54 twice before replying, because I had assumed the opposite.
The most useful thing this subcategory does is help people tell an interesting result from an uninteresting one before booking an appointment about it.
A guess, clearly labelled as one.
Post #56 is the version of this I will quote in future. One addition.
Bringing the actual numbers with intervals to an appointment is far more useful than describing them, and clinicians here consistently say so.
Following, with nothing to contribute beyond having asked the same thing elsewhere.