pt-ptt

موضوع: pt-ptt الثلاثاء فبراير 16, 2010 8:24 pm

PT / PTT
Prothrombin time (PT) and partial thromboplastin time (PTT) tests are used to evaluate the coagulation system.

Prothrombin time (PT)
This test is used to evaluate the adequacy of the extrinsic coagulation system and common pathway in the clotting mechanism. Prothrombin time (PT) test provides a control for long-term anticoagulant therapy that usually involves the use of a coumarin derivative (eg, Coumadin). As recommended by the world health organization, prothrombin times are often reported as INR (International Normalized Ratio) which allows more accurate comparison from hospital to hospital.
Partial Thromboplastin Time (PTT or aPTT)
This test is used to evaluate the intrinsic coagulation system. It is also used to monitor heparin therapy, to aid in detecting classical hemophilia A, Christmas disease (hemophilia B), and deficiencies of factor XI.