Diagnosis:
This is a clinical diagnosis with various underlying causes
Clinical features:
Involuntary, nonrhythmic, rapid, irregular, jerky, purposeless, unpredictable, non-sustained
Investigations to consider: consider as appropriate
Tests: for Wilson’s disease
Tests: for Huntington’s disease
Blood smear: increased acanthocytes (suggests neuroacanthocytosis)
Uric acid in young: Lesch-Nyhan disease