There are some tests that you should consider when following up with a patient with PD. Remember that in every visit you should confirm your PD diagnosis. Atypical features should make you consider other diagnosis.
The following tests should be considered:
Meara J, Bhowmick BK, Hobson P. Accuracy of diagnosis in patients with presumed Parkinson’s disease. Age Aging. 1999;28(2):99-102