A simple, affordable paper-based blood test turns blue to indicate disease.
Developed in a collaboration between Eindhoven University and Keio University, the test would be particularly useful in remote and impoverished regions, and is also very easy to use. A drop of blood is placed on the paper strip, where it combines with a luminous sensor protein created by the Eindhoven team to trigger a blue-green light. That light can then be analyzed on the spot by a smartphone to determine the level of infection.
Each strip has three spots that can be tuned to detect specific diseases, allowing clinicians to test for three different diseases at one time (such as a successful simultaneous test for the flu, dengue fever and HIV).