A device and a method to provide a more reliable and accurate measurement of hematocrit (Hct) by noninvasive means. The changes in the intensities of light of multiple wavelengths transmitted through or reflected light from the tissue location are recorded immediately before and after occluding the flow...http://www.google.co.uk/patents/US20020165439?utm_source=gb-gplus-sharePatent US20020165439 - Method and apparatus for improving the accuracy of noninvasive hematocrit measurements
