Calculate the INR using the following data: Patient's PT 23.5 sec Mean normal PT 11.5 sec ISI 1.15

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Multiple Choice

Calculate the INR using the following data: Patient's PT 23.5 sec Mean normal PT 11.5 sec ISI 1.15

Explanation:
The main idea is that INR standardizes a patient’s prothrombin time across different reagents by using the ISI. The calculation is INR = (PT_patient / PT_normal)^ISI. Plugging in the numbers: PT_patient / PT_normal = 23.5 / 11.5 ≈ 2.0435. Raise this to the power of the ISI: 2.0435^1.15 ≈ 2.27. So the INR is about 2.27, which is typically rounded to 2.3. Therefore, the correct choice is the value around 2.3. The given option of 2.0 does not match the calculation.

The main idea is that INR standardizes a patient’s prothrombin time across different reagents by using the ISI. The calculation is INR = (PT_patient / PT_normal)^ISI.

Plugging in the numbers: PT_patient / PT_normal = 23.5 / 11.5 ≈ 2.0435. Raise this to the power of the ISI: 2.0435^1.15 ≈ 2.27. So the INR is about 2.27, which is typically rounded to 2.3.

Therefore, the correct choice is the value around 2.3. The given option of 2.0 does not match the calculation.

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