Evaluation of Activated Protein C Resistance Using Thrombin Generation Test

Area of Science:

• Hematology
• Coagulation Science
• Thrombosis Research

Background:

• Activated protein C (APC) resistance (APCR) is a significant risk factor for venous thromboembolism (VTE).
• The Factor V Leiden (FVL) mutation (G1691A) was initially identified as the primary cause of APCR.
• Numerous other genetic and physiological factors contribute to APCR, including other F5 mutations, protein S deficiency, elevated factor VIII, hormone use, pregnancy, and postpartum states.

Purpose of the Study:

• To highlight the public health challenge posed by the widespread prevalence of APCR.
• To compare the diagnostic capabilities of existing clotting time-based assays with newer thrombin generation-based assays.
• To introduce the endogenous thrombin potential (ETP)-based APCR assay as a global coagulation test for detecting diverse APCR conditions.

Main Methods:

• Review of current diagnostic methodologies for APCR.
• Description of clotting time-based assays and their limitations in detecting non-FVL related APCR.
• Detailed explanation of the endogenous thrombin potential (ETP)-based APCR assay methodology.

Main Results:

• Clotting time-based assays are primarily designed for the Factor V Leiden mutation and may miss other causes of APCR.
• The ETP-based APCR assay provides a more global assessment of coagulation, capturing multiple APCR conditions.
• The ETP assay offers more comprehensive information compared to traditional clotting assays.

Conclusions:

• APCR is a multifactorial condition associated with increased VTE risk.
• The ETP-based APCR assay is a promising global coagulation test for screening various APCR conditions.
• Accurate detection of APCR through advanced assays is crucial for preemptive therapeutic interventions and public health.