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This is a test derived from another, the prothrombin ratio. It measures the extrinsic clotting pathway system, commonly used to measure warfarin (blood thinning) drugs. A normal, healthy person will have an INR of 1. In warfarin therapy, an INR is usually aimed for around 2.
INR is the international normalized value for prothrombin time. It is a value that measures the extrinsic pathway of clotting, and is often used to determine how quickly the person will make clots. It is often used to determine if the patient is on therapeutic doses of blood thinners.

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What is prothrombin time INR lab test?

The INR has basically replaced the prothrombin time, or PT.


What does the PT test monitor for?

The prothrombin test specifically evaluates the presence of factors VIIa, V, and X, prothrombin, and fibrinogen.


What is the preferred tube for a prothrombin test?

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A light blue-top tube containing sodium citrate is typically used for a prothrombin time (PT) test, which is used to assess blood clotting function.


What other name does the prothrombin time test go by?

The test is also known as the pro time or PT test.


Which blood test evaluates the clotting ability of the blood?

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A test done to determine the time it takes for a blood clot to form is called?

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What test is performed to diagnose conditions associated with abnormal bleeding and to monitor anticoagulant therapy?

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Prothrombin time is a blood test used to evaluate?

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