Hemostasis testing quality is determined by preanalytical variables which encompass patient preparation, sample collection, handling, transportation, processing and storage.  If any of the preanalytical variables are not properly adhered to, incorrect or uninterpretable results are reported resulting in possible adverse patient consequences or delays in treatment.  This webinar will provide background on commonly performed coagulation screening tests but also discuss the impact of preanalytical variables on these tests.