Some things are obvious, but for more detailed and accurate diagnoses your physician needs to perform some tests, often beginning by taking your pulse and blood pressure. But imagine if they already knew your heart rate even before you sat down, and automatically 'saw' a comparison to historic records.
Microsoft’s forthcoming Xbox One Kinect, designed for gaming, can remotely detect your pulse by subtle changes in your face colour – who knew that there is a micro-blush as blood surges under the skin of the face with each pulse!
For me the exciting thing is that this consumer product can do something at a fraction of the cost of a purpose-built device. It could of course do this in your home, recording your pulse as you pass by and uploading the measurement to a data portal. In that case your physician would already have access to continuous records.
Kinect can also deduce the position of your major skeletal elements and how you move. This is a critical feature to interpret how you are interacting with a game, but it can of course monitor your normal movements and upload those. Progressive impairment of joint motion and compensatory movements should be detectable.
The first generation Kinect can measure respiratory rate remotely, but the newer version is much more sensitive.
An alternate implementation would be a diagnostic bed, such as shown in the original Star Trek series, which measured patient vitals as they were lying without any sensors being attached to them.