Partial thromboplastin time

PTT; the PTT indicates the efficacy of the contact-activation blood-coagulation pathways, and is indicative of abnormalities in blood clotting (e.g., owing to a deficiency in coagulation factors) or the effectiveness of treatment with anti-coagulants (e.g., heparin), with a physiological range for PTT between 25 and 39 seconds See pro-thrombin time