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Physiological parameter confidence measure

  • US 9,549,696 B2
  • Filed: 09/21/2015
  • Issued: 01/24/2017
  • Est. Priority Date: 03/01/2005
  • Status: Active Grant
First Claim
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1. A physiological parameter measurement method comprising:

  • receiving light intensity values responsive to detection of light at the three or more wavelengths after transmission into a tissue site and attenuation by the tissue site;

    determining a physiological measurement including an indication of a relationship among the light intensity values at three or more wavelengths;

    selecting, based on the physiological measurement, at least one of a plurality of reference data sets, wherein the reference data sets are empirically determined and each include a respective indication of a relationship among empirically determined light intensity values for a respective measurement at the three or more wavelengths;

    comparing the physiological measurement to the selected at least one of the reference data sets at the three or more wavelengths; and

    determining, based on the comparison, a measure of confidence in the physiological measurement.

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