Supporting Smartphone-Based Image Capture of Rapid Diagnostic Tests in Low-Resource Settings

Chunjong Park, Alex Mariakakis, Shwetak Patel, Jane Yang, Diego Lassala, Ari Johnson, Beatrice Wassuna, Fatou Fall, Marème Soda Gaye, Isaac Holeman
PDF
RDTScan helps community health workers capture high-quality images of malaria rapid diagnostic tests (RDTs) collected in real-world environments without the need of extra hardware.

Abstract

Rapid diagnostic tests (RDTs) provide point-of-care medical diagnosis without sophisticated laboratory equipment, making them especially useful for community health workers (CHWs). Because the procedure for completing a malaria RDT is error-prone, CHWs are often asked to carry completed RDTs back to their supervisors. Doing so makes RDTs susceptible to deterioration and introduces inefficiencies in the CHWs' workflow. In this work, we propose a smartphone-based RDT capture app, RDTScan, that facilitates the collection of high-quality RDT images to support CHWs in the field. RDTScan does not require an external adapter to control the image capture environment, but instead provides real-time guidance using image processing to obtain the best image possible. During the evaluation study, we found that RDTScan provided 98.1% sensitivity and 99.7% specificity against visual inspection of the RDTs. RDTScan helped CHWs capture high-quality RDT images within 18 seconds while providing the CHWs and supervisors better RDT workflow.