Method for non-invasive and in-vitro hemoglobin concentration measurement
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United States of America Patent
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Jan 3, 1995
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app pub date -
Jan 13, 1994
filing date -
May 8, 1992
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Abstract
A non-invasive and an in-vitro method for determining a person's hemoglobin concentration are described. The methods employ substantially simultaneous measurements of absorbance of near-infrared and long wavelength visible light. The measurement consists of a combination of ordinary absorbance data at multiple wavelengths in the form of a ratio or of a ratio of derivative absorbance data. The method minimizes the need for path-length measurement or extinction coefficient determination or estimation of scattering losses. In the in-vitro setting, the method minimizes the need for cell lysis or for reagents.
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