Adding the clinical framing, because it changes how the question reads. The version of this that has an answer is narrower than the version being asked. Narrow it and it becomes tractable; leave it broad and the thread will produce nine confident and incompatible replies.
A narrower follow-up, since the general answer is now clear:
How would you tell the difference between that and the alternative explanation?
Dr.KarenChen said:The version of this that has an answer is narrower than the version being asked.
Filing a mild objection. Mild because I might be wrong; an objection because nobody has addressed the case that does not fit. The objection nobody has made: this only works if the measurement is doing what we assume it is doing, and that assumption has not been tested here.
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Browse GL BiochemDr.KarenChen said:The version of this that has an answer is narrower than the version being asked.
Agreed, and one caution: a single measurement is not a measurement. Anything that moves day to day needs a trend before it means anything at all.