Patent ID: 8175668

Claim:
A method for determining a value of oxygen saturation of blood, comprising: (a) determining a value R 1 indicative of a relative reflectance of the blood for light of a first wavelength compared to light of a second wavelength, and determining a value R 2 indicative of a relative reflectance of the blood for light of the second wavelength compared to light of a third wavelength; (b) determining a value m indicative of a level of hematocrit of the blood; and (c) determining a value of oxygen saturation of the blood utilizing a first polynomial function of the values R 1 and R 2 divided by a second polynomial function of the values R 1 and R 2 , wherein one of the first and second polynomial functions of the values R 1 and R 2 includes the value m as a factor; wherein at least one of steps (a), (b) and (c) is performed using at least one processor.