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Preanalytic Variables in Special Coagulation Testing

Clinical Implications

Special Coagulation Test Algorithms

Slide 4

October 2008

Commonly ordered coagulation test include prothrombin time (PT) and activated partial thromboplastin time (aPTT). Additional specialized assays include individual clotting factor assays, and assays for anticoagulant proteins such as protein C and antithrombin.

DNA-based on molecular tests are not based on the clotting assays, such as the PT and aPTT, and have a different set of preanalytical variables affecting results.

Special Coagulation Test Algorithms


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