“Home diagnostics” are a $5 billion industry—and growing. Spurred by social media, people are buying into at-home health tests, without input from their doctors, and often, not even the FDA.   Guest:  Elizabeth Dwoskin, reporter for the Washington Post Want more What Next TBD? Subscribe to Slate Plus to access ad-free listening to the whole What Next family and all your favorite Slate podcasts. Subscribe today on Apple Podcasts by clicking “Try Free” at the top of our show page. Sign up now at slate.com/whatnextplus to get access wherever you listen. Learn more about your ad choices. Visit megaphone.fm/adchoices