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Figure 25-5
Procedure for determining whether coagulation tests are
needed. PT, prothrombin time; PTT, partial thromboplastin time. (Redrawn
and modified from Roizen MF, Hurd MJ: Preoperative patient evaluation. In
Rogers MC (ed): Current Practice in Anesthesiology, 2nd ed. St. Louis, Mosby-Year
Book, 1990, p 14.)
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