Which prothrombin time (PT) and partial thromboplastin time (PTT) results are characteristic of thrombotic thrombocytopenic purpura (TTP)?

Updated: Feb 18, 2019
  • Author: Theodore Wun, MD, FACP; Chief Editor: Srikanth Nagalla, MBBS, MS, FACP  more...
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Answer

Prothrombin time (International Normalized Ratio) and activated partial thromboplastin time results typically are normal in both TTP and in hemolytic-uremic syndrome (HUS), although some series report patients with slight elevations on both tests.


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