i think they test ANA when not all of your symptoms are consistent with MS.
Multiple Sclerosis - Lab Tests
they would test for liver enzymes to see if it's safe to give you certain medications, i think. if they're already high, they'd want to try to stay away from certain drugs.
iron deficiency is a good thing to avoid, they want to rule out lots of things before they put you in the MS category. they should be testing your B12 and folate also.
hope that helps,