<prompt> Prothombin Time PT of a patient is 26, Control PT is 13 seconds and Sensitivity index is 1.41. What will be the INR of this patient?26132613 x 1.4126131.4126131.41  <response>: The INR calculation has become a standard method for monitoring the PT values. It is calculated as patient prothrombin timemean prothrombin timeISI. Patient prothrombin time 26 Mean prothrombin time 13 ISI International Sensitivity Index 1.41 INR 26131.41 Ref: Laboratory Hematology Practice By Kandice Kottke-Marchant, Bruce Davis, Page 424; Goodman and Gilmans The Pharmacological Basis of Therapeutics, 11th Edition, Page 1479; Physician Assistants Clinical Companion By Springhouse, Pages 89-91 