Platelet aggregation studies in whole human blood

Area of Science:

• Hematology
• Clinical Pathology
• Biomedical Engineering

Background:

• Platelet aggregation studies are crucial for diagnosing and managing bleeding disorders.
• Traditional methods often require processing blood into platelet-rich plasma (PRP), which can alter platelet function.
• A need exists for direct, reliable methods to assess platelet aggregation in whole blood.

Purpose of the Study:

• To evaluate the efficacy of the Ultra Flo 100 Whole Blood Platelet Counter for measuring platelet aggregation in native whole blood.
• To compare the kinetics and reversibility of platelet aggregation induced by various agonists in whole blood.

Main Methods:

• Whole human blood was analyzed using the Ultra Flo 100 Whole Blood Platelet Counter.
• Platelet aggregation was induced using adenosine 5'-diphosphate (ADP), collagen, and thrombin at varying concentrations.
• Scanning electron microscopy confirmed aggregate formation; EDTA was used as a control anticoagulant.

Main Results:

• The Ultra Flo 100 accurately detected platelet aggregation as a decrease in platelet count.
• Aggregation induced by ADP and thrombin peaked within 1 minute, while collagen-induced aggregation peaked within 3 minutes.
• Responses to low agonist concentrations were reversible, whereas high concentrations and collagen resulted in irreversible aggregation.

Conclusions:

• The Ultra Flo 100 provides a rapid, sensitive, and reliable method for direct measurement of platelet aggregation and disaggregation in whole blood.
• This technique offers a valuable tool for both in vitro and ex vivo hematological assessments.
• The findings support direct whole blood analysis as a viable alternative to PRP-based aggregometry.