Method for performing spectroscopic analysis of inhomogeneous test samples
First Claim
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1. A method for spectroscopic analysis of fluid test samples comprising:
- (a) providing a test sample for spectroscopic analysis to an optical cell;
(b) performing a plurality of signal measurements on said test sample;
(c) selecting from said signal measurements one or more sets of measurements having both low variability relative to the range of variation of the signal measurements or a defined threshold, and either signal level maxima or signal level minima; and
(d) analyzing the test sample utilizing said one or more selected set of signal measurements.
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Abstract
A method is provided for more accurately calculating the concentration of analytes or components in test samples. The method includes the use of an algorithm for analysis, and selection of sets of signal measurements from a spectrophotometer. Sets of signal measurements are selected to avoid inhomogeneities, i.e. air bubbles, artifacts and dilution, in test samples being analyzed. The method has application to the spectroscopic determination of the concentration of hemoglobin derivatives or fractions in a blood sample.
15 Citations
28 Claims
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1. A method for spectroscopic analysis of fluid test samples comprising:
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(a) providing a test sample for spectroscopic analysis to an optical cell; (b) performing a plurality of signal measurements on said test sample; (c) selecting from said signal measurements one or more sets of measurements having both low variability relative to the range of variation of the signal measurements or a defined threshold, and either signal level maxima or signal level minima; and (d) analyzing the test sample utilizing said one or more selected set of signal measurements. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A method of performing optical flow cell transmittance measurements of inhomogeneous blood samples comprising:
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(a) providing a fluid test sample to an optical cell; (b) performing a plurality of transmittance measurements on said test sample; (c) selecting from said transmittance measurements one or more sets of transmittance measurements having both low variability relative to the range or group of signal measurements or to defined threshold; and
either transmittance maxima;
or transmittance minima signal levels; and(d) utilizing selected set of transmittance measurements to analyze said test sample. - View Dependent Claims (16, 17, 18, 19)
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20. In a method of performing a series of spectral signal measurements of a test sample, wherein the improvement comprises:
- selecting a set of spectral measurements having both low variability, relative to the range or group of sample measurements or to a defined threshold, and one of high or low spectral signal levels, wherein said set of measurements is made at a single spectral region and is utilized for analyzing said test sample.
- View Dependent Claims (21, 22, 23, 24, 25)
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26. In a method of performing a plurality of spectral measurements on a test sample, wherein the improvement comprises:
- selecting a set of signal measurements having low variability relative to the range or group of signal measurements or to a defined threshold; and
utilizing said selected set of measurements to analyze said test sample. - View Dependent Claims (27)
- selecting a set of signal measurements having low variability relative to the range or group of signal measurements or to a defined threshold; and
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28. A method for multiple wavelength spectroscopic analysis of hemoglobin fractions, wherein the improvement comprises:
- selecting a wavelength for an absorbance maxima of a blood sample and utilizing the results of a plurality of signal measurements at said wavelength to select a set of signal measurements from which data is provided at other wavelengths for use in determining the concentration of said hemoglobin fractions, wherein the selected set of signal measurements exhibits low variability to inhomogeneities in the blood sample.
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