International normalized ratio (INR)

Definition

International Normalized Ratio (INR) is a standardized measure used to assess the blood’s clotting tendency. It is commonly used to monitor patients on anticoagulant therapy, especially warfarin.

5 Must Know Facts For Your Next Test

1. INR helps determine the effectiveness of warfarin and other anticoagulants.
2. An INR value of 2.0-3.0 is typically targeted for most conditions requiring anticoagulation.
3. High INR values indicate a higher risk of bleeding, while low values suggest a risk of clotting.
4. Frequent monitoring of INR is necessary to adjust dosages and ensure patient safety.
5. Certain foods, medications, and health conditions can affect INR levels.

Review Questions

• What does an elevated INR indicate in a patient taking warfarin?
• Why is it important to regularly monitor INR in patients on anticoagulants?
• How can diet impact a patient's INR when they are on anticoagulant therapy?

Related terms

Prothrombin Time (PT): A blood test that measures the time it takes for plasma to clot.

Warfarin:

An oral anticoagulant medication used to prevent blood clots.

Vitamin K:

A vitamin that helps regulate blood clotting and can influence INR levels.