What is the primary clinical use of measuring prothrombin time?

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Assessing the process of clot retractionDetermining the number of plateletsDiagnosing hemophiliaMonitoring patients on anticoagulant therapy

Explanation

Prothrombin time is mainly used to monitor the effectiveness of anticoagulant medications in patients. It is not suitable for evaluating clot retraction, platelet counts, or diagnosing hemophilia.