According to this site they do exist as smartphone apps that do pretty much the same as high end hospital equipment!




“In the past eight months, products that turn a phone into a blood pressure monitoring cuff, a CT-scan viewer, and other health-care gadgets have received Food and Drug Administration clearance. The market is tiny but expected to grow rapidly: By 2015, 30 percent of the world’s smartphone users will be using mobile health products, up from 5 percent today, estimates mobile market consultancy research2guidance. “Health care will be fundamentally different than it used to be,” says Bakul Patel, a policy adviser at the FDA.”

http://www.imedicalapps.com/2011/10/...ng-appearance/