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