 The LighTouch device shines imperceptible red light into the skin and measures the light that comes back out using the method of Raman Spectroscopy. Some of this light is color shifted and some is not. Using a proprietary numerical recipe, the LighTouch device combines the signals in this remitted light and calculates hematocrit, glucose, protein and potentially other analytes. Thus the LighTouch device produces information without painful physical insult to the patient and can trend changes in these blood analytes in order to predict the need for intervention. 