nanonug
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It sounds to me like a diagnosis of ME/CFS as you defined it can only be accepted if every other existing disease on the planet is excluded.
I didn't define anything. Feel free to use whatever consensus criteria you want. The point is that a diagnosis based on self-reported symptoms isn't going to be as accurate as one based on some objective measure. At the end of the day, diagnosing anything - even those conditions for which there are objective measures - is a probabilistic endeavor. And being a probabilistic endeavor, it is prone to false positives and false negatives. I'd wager that conditions diagnosed based on self-reported symptoms have a much higher rate of false positives (and maybe negatives) than those for which there are objective measures.