All are true about heparin induced thrombocytopenia (HIT), EXCEPT:
Thrombocytopenia is not severe usually
Associated with bleeding especially from GI tract
Marked increase in thrombosis
HIT can occur after exposure to low molecular weight heparin
Drug induced thrombocytopenia due to heparin has some special features. It will not lead to bleeding. Marked thrombocytopenia < 20,000 is rare. Thrombosis is a major complication. Ref: Harrisons principles of internal medicine, Edition -18, Page - 967