Transcription of PT, INR, and APTT Testing
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Volume XXIII Issue 2 March/April 2018. PT, INR, and APTT Testing by Lori Eschenbacher, BSMT(ASCP)CLS(NCA) tors oral anticoagulant therapy ( , Coumadin). This test Washington State DOH, Lab Quality Assurance may also be ordered for patients suspected of DIC, liver failure, and Vitamin K deficiencies. M. illions of Americans take oral anticoagulant therapy ( , Coumadin). For each of these pa- The PT test evaluates the extrinsic tissue factor pathway tients, the Prothrombin Time (PT), International and common pathways of the coagulation cascade VII, X, Normalized Ration (INR), and Activated Partial Throm- V, II, and I (fibrinogen).
coagulation testing samples, and 5) miscellaneous information. Please Note: For single-use devices (e.g. Roche Diagnos-tics CoaguChek, ITC Prothrombin Time Microcoagulation System, etc.), the laboratory should refer to the manufac-turer’s instructions for specimen requirements, procedures, and quality control requirements. 1) Basic ...
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