What if receiving a medical diagnosis was as simple as shopping online? The growing home diagnostics industry says it can be. At-home testing was widespread during the COVID-19 pandemic, but more health tech companies also offer DIY kits that test for food allergies, fertility and thyroid function, among other things. Some medical experts are wary of this on-demand model, but health tech investors say it can make health care more accessible. Marketplace’s Lily Jamali spoke to Chrissy Farr, author of the Second Opinion newsletter, and Anarghya Vardhana, a partner at the Maveron venture firm, about the prospects of the industry and how it affects relationships between patients and doctors.