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International Normalized Ratio (INR)

What is the Lab Name for International Normalized Ratio?

International Normalized Ratio

What is the Lab Abbreviation for International Normalized Ratio?

INR

What is International Normalized Ratio in terms of Nursing Labs?

International normalized ratio(INR) takes results from a prothrombin time test and standardizes it regardless of collection method.

What is the Normal Range for International Normalized Ratio?

0.8 – 1.2 Therapeutic Levels on Warfarin 2.0 – 3.5

What are the Indications for International Normalized Ratio?

  • Evaluate therapeutic doses of Warfarin
  • Identify patients at higher risk for bleeding
  • Identify cause of:
    • Bleeding
    • Deficiencies

What would cause Increased Levels of International Normalized Ratio?

  • Disseminated Intravascular Coagulation (DIC)
  • Liver disease
  • Vitamin K deficiency
  • Warfarin

What would cause Decreased Levels of International Normalized Ratio?

  • Too much vitamin K
  • Estrogen containing medications such as birth control

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