A low-cost, rapid diagnostic test for COVID-19 developed by Penn Medicine provides COVID-19 results within four minutes with 90% accuracy. A paper published in Matter details the fast and inexpensive diagnostic test, called RAPID 1.0 (Real-time Accurate Portable Impedimetric Detection prototype 1.0). Compared to existing methods for COVID-19 detection, RAPID is inexpensive and highly scalable, allowing the production of millions of units per week. RAPID was developed by a team led by César de la Fuente, a presidential assistant professor in psychiatry, microbiology, chemical and biomolecular engineering, and bioengineering.