Rattlesnake envenomations may induce various coagulation abnormalities, including thrombocytopenia, prolongation of prothrombin time (PT, measured by the INR [international normalized ratio]) or activated partial thromboplastin time (PTT), hypofibrinogenemia, elevated fibrin degradation products, or a combination of these disorders, resembling a disseminated intravascular coagulation (DIC) - like syndrome.