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Master INR Lab Value with Picmonic for Nursing RN

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INR Lab Value

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INR Lab Value

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Because of the variability in reagents used to calculate the prothrombin time (PT) between laboratories, the INR or PT ratio was developed to create an international standard. It is the ratio between the patient’s PT to a control PT.

3 KEY FACTS

INR or PT Ratio is a normalized value ratio that standardizes the measurement among labs for PT. The normal range for INR or PT ratio is between 0.8-1.2, but check your lab's range as it can differ slightly. Remember that because it is a ratio you want the value to be close to 1.

Patients on warfarin (Coumadin) are monitored via their INR, which should be 2.0 to 3.0 (higher than the normal range).

Patients on warfarin (Coumadin) should have values between 2 to 3.

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