[Standardization of the thromboplastin time determination]

Area of Science:

• Clinical Chemistry
• Hematology
• Medical Diagnostics

Context:

• Prothrombin time (PT) determination is crucial for monitoring oral anticoagulant therapy.
• Standardization of PT reagents is essential for accurate and comparable results.
• Existing PT methods and reagents varied significantly, impacting therapeutic monitoring.

Purpose:

• To assess the feasibility of manufacturers adhering to international standardization recommendations for thromboplastin preparations.
• To evaluate the suitability of new manufacturing processes for producing sensitive and calibratable thromboplastin reagents.
• To demonstrate how calibrated thromboplastins facilitate the implementation of the International Normalized Ratio (INR) scale.

Summary:

• Current manufacturing processes allow for the production of thromboplastin reagents that meet international standardization guidelines for both coagulometric and photometric PT determination.
• These advanced manufacturing techniques yield sensitive thromboplastins, enabling calibration according to international committee recommendations.
• The use of calibrated thromboplastins facilitates the adoption of a common scale, the International Normalized Ratio (INR), for monitoring oral anticoagulation intensity.

Impact:

• The widespread adoption of standardized, calibrated thromboplastins and the INR system significantly enhances the comparability of therapeutic ranges.
• This improved comparability ensures greater continuity and reliability of oral anticoagulant therapy for patients, even across different healthcare systems and countries.
• Facilitates more consistent patient management and reduces variability in anticoagulation control worldwide.