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Hi Karen,
Yes, Uhthoff’s phenomenon is temporary (<24 hours) and is not indicative of a relapse or exacerbation. Interestingly, Uhthoff's phenomenon was once used as in the diagnosis of MS ("hot bath test") before MRI and CSF analysis were as advanced as they are now.

I don't recommend spending time memorizing the names and administration routes and timelines for the medications. I think understanding that different medications are used for managing relapses versus disease-modifying pharmacologic therapies and that various routes of administration are used is sufficient. There's a chance something super specific could sneak onto the test, but this is unlikely and your time is likely better spent on bigger topics.

The 25FWT is part of the MS Functional Composite assessment (https://www.nationalmssociety.org/For-Professionals/Researchers/Resources-for-MS-Researchers/Research-Tools/Clinical-Study-Measures/Multiple-Sclerosis-Functional-Composite-(MSFC)). This is likely why physicians who see patients with MS tend to use the 25FWT in their exams.