This electricity-free microfluidic chip separates plasma from whole blood with 98% efficiency using capillary action, eliminating the need for centrifuges. Compact, affordable, and easy to manufacture, it enables essential diagnostic testing in remote or underserved settings. Already used in a rapid allergy testing kit, the technology supports broader screening for chronic and infectious diseases. Its passive design ensures scalability, bringing reliable, low-cost diagnostics closer to the point of need and helping reduce healthcare inequality