A simple CBC is cheap, fast, accurate and the diagnostic<unk>  of choice for thrombocytopenia. Further investigations to look for the cause of thrombocytopenia is based on patient's history, symptoms and the judgment of the clinician in any specific condition.
Thrombocytopenia diagnostic study of choice
Thrombocytopenia differential diagnosis
Thrombocytopenia risk factors
Autoimmune hemolytic anemia diagnostic study of choice
Glanzmann's thrombasthenia other diagnostic studies
Thrombocytopenia pathophysiology
Essential thrombocytosis other diagnostic studies
Aplastic anemia diagnostic study of choice