Dialysis filter may cause thrombocytopenia
Too few
Thrombocytopenia
Nonfunctional
Aspirin
Von Willebrand disease
Thrombocytopenia
Aspirin
Von Willebrand disease
Acquired (Drug Related)
Warfarin (Coumadin)
Unfractionated heparin
Low molecular weight heparin (i.e. enoxaparin (Lovenox), dalteparin)
Factor Xa Inhibitors (e.g. rivaroxaban, apixaban, fondaparinux, edoxaban)
Direct thrombin inhibitors (e.g. dabigatran, argatroban, bivalirudin)
Illness induced
Vitamin K deficiency
Disseminated Intravascular Coagulation (DIC)
Liver disease induced coagulopathy<unk> 
Genetic
Hemophilia
Factor VIII inhibitor
Lupus anticoagulant
Warfarin (Coumadin)
Unfractionated heparin
Low molecular weight heparin (i.e. enoxaparin (Lovenox), dalteparin)
Factor Xa Inhibitors (e.g. rivaroxaban, apixaban, fondaparinux, edoxaban)
Direct thrombin inhibitors (e.g. dabigatran, argatroban, bivalirudin)
Vitamin K deficiency
Disseminated Intravascular Coagulation (DIC)
Liver disease induced coagulopathy<unk> 
Hemophilia
Factor VIII inhibitor
Lupus anticoagulant
Uremic bleeding syndrome
Dialysis filter may cause thrombocytopenia
Heparin-Induced Thrombocytopenia 
Too few
Hyperviscosity syndrome
Thrombocytopenia
Liver disease induced coagulopathy
Nonfunctional