Optimizing Platelet-Rich Plasma: Spin Time and Sample Source

Area of Science:

• Hematology
• Biomedical Engineering

Background:

• The buffy coat, a layer in centrifuged blood, traditionally separates plasma from red blood cells (RBCs).
• The distribution of platelets (PLTs) and leukocytes (WBCs) within centrifuged blood layers is not well-characterized.

Purpose of the Study:

• To describe the distribution of platelets and leukocytes in centrifuged blood.
• To determine optimal methods for platelet-rich plasma or buffy coat layer aspiration.

Main Methods:

• Centrifugation of anticoagulated blood samples (8.5 mL) at 1000× g for varying durations (1-20 min).
• Division of centrifuged samples into ten layers for cellular composition analysis.
• Analysis of cellular composition and mean platelet volume (MPV) in each layer.

Main Results:

• Significant percentages of platelets (15% in plasma, 65% in RBCs) remain outside the buffy coat even after 20 min of centrifugation.
• Optimal platelet recovery is achieved by aspirating a 1 mL volume centered around the buffy coat.
• Maximum platelet counts are obtained within 5 min of centrifugation using this aspiration method.

Conclusions:

• Standard buffy coat aspiration methods may lead to suboptimal platelet recovery.
• A revised aspiration technique, encompassing a broader layer around the buffy coat, enhances platelet yield.
• Understanding platelet distribution is crucial for optimizing blood component preparation.