A method and apparatus for noninvasively monitoring hemoglobin concentration and oxygen saturation, wherein the method includes selecting at least two wavelengths from a region of wavelengths in which an extinction coefficient for water is smaller that for hemoglobin, the at least two wavelengths including...http://www.google.com/patents/US6714805?utm_source=gb-gplus-sharePatent US6714805 - Method and apparatus for noninvasively monitoring hemoglobin concentration and oxygen saturation
