International Normalized Ratio (INR) Lab Values

Normal 0.8 - 1.2 Therapeutic Levels of Warfarin 2.0 – 3.5 Indications Evaluate therapeutic doses of Warfarin Identify patients at higher risk for bleeding Identify cause of: Bleeding Deficiencies Description International normalized ratio(INR) takes results from a prothrombin time test and standardizes it regardless of collection method. What would cause increased levels? Disseminated Intravascular Coagulation (DIC) Liver disease Vitamin K deficiency Warfarin What would cause decreased levels? Too much vitamin K Estrogen containing medications such as birth control