<unk>  may be used for both prevention and the treatment of thrombosis. It exists in two main forms: an "unfractionated" form that can be injected under the skin (subcutaneously) or through an intravenous infusion, and a "low molecular weight" form that is generally given subcutaneously. Commonly used low molecular weight<unk> s are enoxaparin, dalteparin, nadroparin and tinzaparin. In<unk> , the platelet count in the blood falls below the normal range, a condition called<unk> . However, it is generally not low enough to lead to an increased risk of bleeding. Most people with<unk> , therefore, do not experience any symptoms. Typically, the platelet count falls 5–14 days after<unk>  is first given; if someone has received<unk>  in the previous three months, the fall in platelet count may occur sooner, sometimes within a day. The most common symptom of<unk>  is enlargement or extension of a previously diagnosed blood clot, or the development of a new blood clot elsewhere in the body. This may take the form of clots either in arteries or veins, causing arterial or venous thrombosis, respectively. Examples of arterial thrombosis are stroke, myocardial infarction ("heart attack"), and acute leg ischemia. Venous thrombosis may occur in the leg or arm in the form of deep vein thrombosis (DVT) and in the lung in the form of a pulmonary embolism (PE); the latter usually originates in the leg, but migrates to the lung. In those receiving<unk>  through an intravenous infusion, a complex of symptoms ("systemic reaction") may occur when the infusion is started. These include fever, chills, high blood pressure, a fast heart rate, shortness of breath, and chest pain. This happens in about a quarter of people with<unk> . Others may develop a skin rash consisting of red spots.
Heparin-induced thrombocytopenia
Sticky platelet syndrome
Venom-induced consumption coagulopathy
Pseudo gray platelet syndrome
Drug-induced thrombocytopenic purpura
Gray platelet syndrome
Disseminated intravascular coagulation
Immune thrombocytopenic purpura