An outpatient comes to the laboratory for a PT. He had been in the hospital 6 weeks earlier for treatment of deep vein thrombosis (DVT).

An outpatient comes to the laboratory for a PT. He had been in the hospital 6 weeks earlier for treatment of deep vein thrombosis (DVT).

PT: 14.0 sec
Thromboplastin International Sensitivity Index (ISI): 2
PT reference range: 11-13 sec (for this laboratory)
aPTT: not requested

1. Interpret the coagulation results.
2. What is the patient’s international normalized ratio (INR)?
3. Based on all the data provided, what condition is most likely?
4. Is the patient taking enough oral anticoagulant?
5. What is the risk for this patient?

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