What are therapeutic uses of heparin?

Tx acute DVT and PE, Prophylactic to prevent postop venous thrombosis and those in acute phase MI. Extracorporeal devices (dialysis machine) to prevent thrombosis. AG of choice for pregnant women as they don't cross placenta due to large size and negative charge. Don't require same intense monitoring as heparin makes them useful for both inpatient and outpatient therapy