Thrombotic thrombocytopenic purpura diagnostic study of choice
Complete blood count (CBC) with platelet count
Review of the peripheral blood smear
Serum electrolytes and creatinine
Serum lactate dehydrogenase (LDH)
Serum bilirubin level
Coagulation testing ( PT, aPTT, fibrinogen, D-dimer)
Serum haptoglobin level
Direct antiglobulin (Coombs) test (DAT)
ADAMTS13 activity and inhibitor testing