Closing the loop on my own question.
Closing the loop. The answer turned out to depend on the detail I had left out of the opening post, which is a lesson about how to ask rather than about the subject.
Dr.PeteFamMed said:If two explanations both fit, the useful question is which one predicts something the other does not.
There is a second half to this that has not been said yet. The distinction that resolves most of these threads is between what is true on average and what is true for one person. Both are real; they answer different questions and get quoted as if they were the same one.
The figures, for anyone assembling their own picture. Practical: whatever you change, write down the date and the reason. In three months the reason is what you will have forgotten, and the reason is what makes the record worth having.
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Browse GL BiochemOne thing that is still open after Dr.PeteFamMed’s answer:
What would you measure differently if you were starting again?
Old thread, but it comes up first when you search for this, so it is worth updating. Worth stating the units and the reference range whenever you post a number here. A large fraction of the apparent disagreement in these threads is two people using different units and both being right.