Primary haemostasis and its assessment by laboratory tests

Area of Science:

• Hematology
• Vascular Biology
• Hemostasis

Background:

• Platelets are essential blood components that patrol blood vessels to prevent blood loss.
• Platelet activation at sites of injury involves three key phases: adhesion, aggregation, and secretion.
• Understanding platelet function is vital for diagnosing and managing bleeding disorders.

Purpose of the Study:

• To provide an overview of laboratory assays used to evaluate platelet function.
• To explain the principles behind common platelet function tests.
• To highlight potential pitfalls in interpreting platelet assay results.

Main Methods:

• Review of established laboratory techniques for assessing platelet adhesion.
• Description of methods for measuring platelet aggregation, including aggregometry.
• Explanation of assays evaluating platelet secretion and granule release.

Main Results:

• Laboratory tests are designed to mimic specific phases of platelet activation.
• Different assays target distinct platelet receptors and pathways, such as glycoprotein (GP) Ib and integrin alpha2bbeta3 (GPIIb/IIIa).
• Accurate assessment requires understanding the principles and limitations of each test.

Conclusions:

• Laboratory tests offer valuable insights into patient platelet function.
• Awareness of assay principles and potential pitfalls is critical for reliable diagnosis.
• Comprehensive evaluation of platelet activity aids in managing hemostasis effectively.