Diagnostic work up!!

[Meesky]

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i know this topic has been beaten to death, but I couldn't find a good answer.
For ordering tests- say it's a dementia/vascular demerita/pseudodementia case. Would you still order a TSH/B12/RPR to rule out reversible causes of dementia??
I guess I'm just confused on whether you can list tests that are not specifically related to the top 3 differentials?

Thanks in advance