A patient with a coagulation disorder is found to have a prolonged prothrombin time and a normal partial thromboplastin time. Which of the following coagulation factors is most likely to be deficient?
Explanation
A prolonged prothrombin time with a normal partial thromboplastin time suggests a deficiency of a factor involved in the extrinsic pathway, such as factor VII.
Source
Henry's Clinical Diagnosis and Management by Laboratory Methods