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New patterned dried plasma spot cards offer improved blood sample collection and storage outside clinical settings. This innovation enhances testing accuracy and accessibility, particularly in resource-limited environments.

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Area of Science:

  • Biomaterials Science
  • Analytical Chemistry
  • Point-of-Care Diagnostics

Background:

  • Plasma separation cards enable decentralized blood testing but face challenges with inconsistent sample volumes and contamination.
  • Existing devices are susceptible to hematocrit variations and red blood cell leakage, impacting plasma purity.

Purpose of the Study:

  • To develop an improved dried plasma spot card for reliable cell-free plasma collection and storage.
  • To enhance sample stability and minimize contamination for broader diagnostic applications.

Main Methods:

  • Integration of patterned dried blood spot card technology with novel porous separation materials.
  • Utilizing a dual vertical separation and lateral distribution fluidic design for discrete plasma collection zones.
  • Quantification of analytes including soluble transferrin receptor (ELISA), potassium (ICP-AES), and 18S rRNA (RT-qPCR).

Main Results:

  • The patterned dried plasma spot card successfully produced cell-free plasma with protected collection zones.
  • Quantitative recovery of diverse analytes was achieved with no significant difference compared to liquid samples.
  • The device demonstrated versatility across immunoassay, elemental analysis, and nucleic acid detection techniques.

Conclusions:

  • The novel patterned dried plasma spot card offers a robust solution for decentralized plasma collection and storage.
  • This technology has the potential to significantly improve access to critical blood testing in resource-limited settings and at the point-of-care.
  • The design mitigates common issues like hemolysis and inconsistent sampling, paving the way for wider adoption.