Many americans are living with a chronic disease, but access to convenient and low-cost health testing isn’t always available for patients, and bottlenecks still exist with current testing approaches. SiPhox Health wants to change that through more advanced blood testing using silicon photonic chip technology to put a lab-grade health testing device in every home. This is the semiconductor technology that transformed internet connectivity. MIT scientists Diedrik Vermeulen and Michael Dubrovsky started the company in 2020 and were part of the Y Combinator summer cohort that year. At the time, the Burlington, Massachusetts–based company was developing a circuit board for optical chips with a goal of replacing refrigerator-sized diagnostic machines with a tiny chip. Its first product was a $1 COVID-19 test on a disposable cartridge.