This document summarizes various inherited and acquired bleeding disorders: 1. It describes disorders of blood coagulation including hemophilia A and B due to factor VIII and IX deficiencies, von Willebrand disease, and liver disease-related deficiencies. 2. Common tests used to evaluate hemostasis such as PT, PTT, bleeding time, and factor assays are outlined. 3. Causes of abnormal coagulation test results and approaches to initial evaluation of a bleeding patient are provided.