Capillary Force-Driven Quantitative Plasma Separation Method for Application of Whole Blood Detection Microfluidic...

Area of Science:

• Biomedical Engineering
• Clinical Diagnostics
• Point-of-Care Testing

Background:

• Accurate plasma separation is crucial for reliable diagnostic testing.
• Current methods for obtaining precise plasma volumes outside laboratory settings are challenging.
• Limitations in blood separation hinder the advancement of self-service point-of-care testing (POCT).

Purpose of the Study:

• To develop and validate a novel technique for precise plasma separation from small blood volumes.
• To address the limitations of current blood separation methods for non-laboratory environments.
• To improve the accuracy and feasibility of point-of-care diagnostic testing.

Main Methods:

• A capillary force-driven membrane filtration technique was employed for blood separation.
• The method was tested using human whole blood with a 48% hematocrit.
• Evaluation focused on the volume of plasma isolated and the margin of error.

Main Results:

• The technique successfully separated 5-30 μL of pure plasma from 100-200 μL of whole blood.
• Plasma separation achieved a margin of error of less than 10%.
• The entire blood separation process was completed within 20 minutes.

Conclusions:

• The capillary filtration method offers a simple, cost-effective, and accurate solution for small-volume plasma separation.
• This innovation overcomes a key bottleneck in self-service POCT, improving testing reliability.
• The developed technique holds significant potential for advancing clinical diagnostics and point-of-care applications.