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International Normalized Ratio (INR)

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International Normalized Ratio (INR)

Lab Name:

International Normalized Ratio

What is the Labs Abbreviation for International Normalized Ratio ?

INR

What is International Normalized Ratio (INR) 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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Date Published - Jun 21, 2016
Date Modified - Aug 27, 2016