Thrombin Generation in Fresh and Frozen-Thawed Platelet Poor Plasma - Is there a Difference?

Area of Science:

• Hematology
• Clinical Chemistry
• Hemostasis Research

Background:

• Thrombin generation assays are crucial for hemostasis research but their clinical applicability remains limited.
• Standardizing sample handling is essential for reliable thrombin generation test results.

Purpose of the Study:

• To compare thrombin generation in fresh platelet-poor plasma (f-PPP) versus frozen-thawed platelet-poor plasma (ft-PPP).
• To assess the consistency of thrombin generation test results using different plasma storage conditions.

Main Methods:

• Prospective study measuring thrombin generation in 54 healthy male donors' plasma.
• Repetitive measurements on fresh plasma and plasma stored at -60°C using the Calibrated Automated Thrombogram (CAT) assay.
• Subgroup analyses included platelet counts and ABO blood groups.

Main Results:

• Agreement for peak thrombin between f-PPP and ft-PPP was approximately 50%.
• Endogenous thrombin potential (ETP) agreement was nearly two-thirds.
• ft-PPP showed slightly slower thrombin generation kinetics. Peak thrombin varied by ABO blood group.

Conclusions:

• Limited agreement exists between f-PPP and ft-PPP for thrombin generation parameters.
• Frozen-thawed plasma (ft-PPP) offers greater practicality for semi-automated assays.
• ft-PPP is recommended for use in clinical studies involving thrombin generation.