Performance and Interpretation of Mixing Tests in Coagulation

Area of Science:

• Hematology
• Clinical Pathology

Background:

• Prolonged clotting times in patients can stem from either a deficiency in coagulation factors or the presence of inhibitors.
• Accurate differentiation is crucial for appropriate clinical management and further laboratory investigation.

Purpose of the Study:

• To present a standardized method for performing mixing tests in coagulation diagnostics.
• To outline procedures for interpreting mixing test results using established formulas.

Main Methods:

• Performing mixing tests by combining patient plasma with normal plasma.
• Applying two distinct interpretation formulas: percent correction and index of circulating anticoagulant.

Main Results:

• Demonstration of how mixing tests effectively differentiate between factor deficiency and inhibitor presence.
• Illustrating the practical application of percent correction and index of circulating anticoagulant calculations.

Conclusions:

• Mixing tests are essential for diagnosing the cause of prolonged clotting times.
• The presented method and interpretation formulas provide a reliable approach for laboratory diagnosis and patient care.