I have this curiosity about how easy or difficult it has to be to find out everything that is in a person's blood. Through all the tools we have available today, would it be possible to find out what is in our blood? From TSH to blood sugar, to cholesterol, isn't there a simpler way of finding out what a person's levels are than going to the hospital, having your blood drawn and waiting a few days? Why can't devices that allow us to check our blood sugar also test levels of iron, lead and calcium and whatever else? Is it possible to do all these blood tests on a compact device?