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aPretest probability score: 6-8 = high; 4-5 = intermediate; 0-3 = low.

bFirst day of immunizing heparin exposure considered day zero; the day the platelet count begins to fall is considered the day of onset of thrombocytopenia (it generally takes 1-3 more days until an arbitrary threshold that defines thrombocytopenia is passed). In general, giving heparin during or soon after surgery is most likely to induce immunization. The scoring system shown here has undergone minor modifications from previously published scoring systems (see Chapter 2).

Abbreviations: ASR, acute systemic reaction; DVT, deep venous thrombosis.

aPretest probability score: 6-8 = high; 4-5 = intermediate; 0-3 = low.

bFirst day of immunizing heparin exposure considered day zero; the day the platelet count begins to fall is considered the day of onset of thrombocytopenia (it generally takes 1-3 more days until an arbitrary threshold that defines thrombocytopenia is passed). In general, giving heparin during or soon after surgery is most likely to induce immunization. The scoring system shown here has undergone minor modifications from previously published scoring systems (see Chapter 2).

Abbreviations: ASR, acute systemic reaction; DVT, deep venous thrombosis.

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