LabGuide 32: Plasma Prothrombin Time and The International Normalized Ratio (INR)
Read LabGuide 32 and be able to:
- Define prothrombin time and what the test demonstrates.
- Describe thromboplastin, how it’s derived, and how different types affect the ability to monitor patients on anticoagulant therapy.
- Explain why the introduction of international thromboplastin standards was necessary, and define the INR and how a patient INR value is determined.
- Describe the prothrombin test procedure, quality control procedures needed to monitor the protime testing process, and limitations of the test.
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