Patent ID: 7142901

Claim:
A monitor comprising: a primary input from which a spectral characteristic of a tissue site is derivable; a secondary input from which at least one parameter is determinable; and a processor configured to output a compensated physiological measurement in response to said primary input and said secondary input utilizing a compensation relationship between said spectral characteristic and said at least one parameter and said compensated physiological measurement; wherein said compensation relationship comprises: baseline calibration data relating said spectral characteristic to an uncompensated physiological measurement; modified calibration data generated from a modification of said baseline calibration data in response to said at least one parameter; and a look-up table having sold spectral characteristic as an input and providing said compensated physiological measurement as an output according to said calibration data; wherein said at least one parameter is a blood gas measurement and said compensation relationship further comprises: a comparison of said uncompensated physiological measurement with said blood gas measurement; a sensitivity control; and modification rules responsive to said comparison and said sensitivity control, said modification rules determining said modification.