I don't know whether a neuro is supposed to do that here, but mine never did. It was so obviously MS, though, that I don't suppose it really mattered. I was too far gone for CRAB drugs to have any effect, not that they make much difference in the entire scheme of things.
You are right: I think neuros should test for Cpn and other things on diagnosis, or if they won't, your GP should. To be treated for Cpn as soon as you are diagnosed must be far better than being treated after years of worsening, when incurable damage might have been done.
An Itinerary in Light and Shadow Completed Dr Charles Stratton / Dr David Wheldon abx regime for aggressive secondary progressive MS in June 2007, after four years. Still improving with no relapses since starting. Can't run but can paint all day.