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 changes in the concentration
of specific analytes in tissue fluid. Also, the method and apparatus can be used
to predict future levels of analyte concentration either in the tissue fluid or
in blood in an adjacent vascular system.