Abstract:
A method determines an analyte concentration in a sample including the analyte and a substance. The method includes providing an absorption spectrum of the sample. The absorption spectrum has an absorption baseline. The method further includes shifting the absorption spectrum so that the absorption baseline approximately equals a selected absorption value in a selected absorption wavelength range. The method further includes subtracting a substance contribution from the absorption spectrum. Thus, the method provides a corrected absorption spectrum substantially free of a contribution from the substance.
Abstract:
A reagentless whole-blood analyte detection system (200, 400, 450, 1000, 1100) that is capable of being deployed near a patient has a source (220) capable of emitting a beam of radiation that includes a spectral band. The whole-blood system (200, 400, 450, 1000, 1100) also has at least one detector (250, 1152, 1154) in an optical path of the beam. The whole-blood system (200, 400, 450, 1000, 1100) also has a housing (402, 452) that is configured to house the source (220) and the detector(s) (250, 1152, 1154). The whole-blood system (200, 400, 450, 1000, 1100) also has a sample element (240, 305, 605, 805, 885, 905, 1040, 1205, 1305, 1355, 1405) that is situated in the optical path of the beam. The sample element (240, 305, 605, 805, 885, 905, 1040, 1205, 1305, 1355, 1405) has a sample cell (242, 310, 610, 810) and a sample cell wall (244, 330, 335) that does not eliminate transmittance of the beam of radiation in the spectral band.
Abstract:
A method determines an analyte concentration in a sample including the analyte and a substance. The method (100) includes providing an absorption spectrum of the sample (200). The absorption spectrum has an absorption baseline. The method further includes shifting the absorption spectrum (300) so that the absorption baseline equals a selected absorption value in a selected wavelength range. The method further includes subtracting a substance contribution (400) from the absorption spectrum. Thus, the method provides a corrected absorption spectrum substantially free of a contribution from the substance.