RT Journal Article SR Electronic T1 Factor V Leiden and Prothrombin G20210A JF Cleveland Clinic Journal of Medicine JO Cleve Clin J Med FD Cleveland Clinic SP 825 OP 836 VO 67 IS 11 A1 Deitcher, Steven R. A1 Caiola, Enrico A1 Jaffer, Amir YR 2000 UL http://www.ccjm.org/content/67/11/825.abstract AB Two recently discovered genetic abnormalities substantially increase the risk of venous thromboembolism. Yet we do not advocate screening for these abnormalities except in cases in which the information gained would affect the course of action.