Smartphone-Based Diagnosis of Parasitic Infections With Colorimetric Assays in Centrifuge Tubes Escobedo Araque, Pablo Erenas Rodríguez, Miguel María Martínez Olmos, Antonio Carvajal Rodríguez, Miguel Ángel Tabraue Chávez, Mavys Luque González, M.Angélica Díaz Mochón, Juan José Pernagallo, Salvatore Capitán Vallvey, Luis Fermín Palma, Alberto J. Smartphone-based platform Parasitic diseases Colorimetric assay Diagnosis Image processing A smartphone-based platform for the diagnosis of parasitic infections has been developed, tested and validated. The system is capable of making automatic and accurate analysis of millimetric colorimetric arrays in centrifuge collection tubes, which are well established tools used in clinical analysis. To that end, an Android-based software application has been developed, making use of the smartphone rear camera, enabling precise image processing of the colorimetric spot arrays. A low-cost plastic accessory has been developed using 3D-printing to provide controlled illumination, xed sample positioning and cell phone attachment. The platform was then tested repeatedly for its size detection, edge blurriness and colour detection capabilities. A minimum spot radius of 175 m is detectable when using the developed app, with a tolerance of 15%, corresponding to 0.25%of the area where the spot array is printed. Spot edge de nition has been studied up to 40% of blurriness, resulting in a low average percentage error of 1.24%. Colour detection follows the well-known Gamma correction function. Finally, the whole platform was tested and validated using real DNA to analyse for accurate discrimination of Trypanosomatid species, which are responsible for devastating diseases in humans and livestock. The smartphone-based platform can be further extended to other clinical analysis. Its simplicity and reliable performance mean it can be used in remote, limited-resource settings by relatively unskilled technicians/nurses, where diagnostic laboratories are sparsely distributed. The results can however be sent easily via the smartphone to medical experts as well as government health agencies. 2020-11-19T11:14:26Z 2020-11-19T11:14:26Z 2019-12-31 journal article Escobedo, P., Erenas, M. M., Olmos, A. M., Carvajal, M. A., Chávez, M. T., González, M. A. L., ... & Palma, A. J. (2019). Smartphone-based diagnosis of parasitic infections with colorimetric assays in centrifuge tubes. IEEE Access, 7, 185677-185686. [DOI:10.1109/ACCESS.2019.2961230] http://hdl.handle.net/10481/64344 10.1109/ACCESS.2019.2961230 eng http://creativecommons.org/licenses/by/3.0/es/ open access Atribución 3.0 España IEEE Inst Electrical Electronics Engineers Inc