Methods for measuring the total hemoglobin of whole blood include measuring reflective light at multiple wavelengths within the visible spectrum, calculating light absorbance at each of the multiple wavelengths, performing a comparison in a change in like absorbance between the multiple wavelengths,...http://www.google.com/patents/US20070060809?utm_source=gb-gplus-sharePatent US20070060809 - Continuous spectroscopic measurement of total hemoglobin
