Why are 570 nm and 600 nm used as measurement wavelengths?

These wavelengths are selected based on the absorbance of hemoglobin: to do oximetry measurements, one oxygen sensitive wavelength and one oxygen insensitive wavelength are used. Oxygenated and deoxygenated hemoglobin have the same light absorbance at 570 nm but not at 600 nm. The oxygen insensitive wavelength serves as a reference in the calculation of hemoglobin oxygen saturation.


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