The present invention relates generally to a non-invasive method and apparatus for measuring a fluid analyte, particularly relating to glucose or alcohol contained in blood or tissue, utilizing spectroscopic methods. More particularly, the method and apparatus incorporate means for detecting and quantifying...http://www.google.de/patents/US20040167382?utm_source=gb-gplus-sharePatent US20040167382 - Non-invasive determination of direction and rate of change of an analyte
