Method for reducing analyzer variability using a normalization target
First Claim
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1. A method to improve precision of a test result from an optical instrument previously calibrated with an external calibrant and having stored in instrument memory a calibration value, comprising:
- providing the optical instrument comprising a normalization target embedded in or on the instrument, the normalization target having an assigned normalization value based on its detected signal relative to detected signal associated with the calibration value, the assigned normalization value stored in instrument memory;
inserting an external calibrant into the instrument;
collecting light emission data from the external calibrant and from the embedded normalization target in a single scan or image;
assigning an updated normalization value to the embedded normalization target;
scanning or imaging in a single scan;
(i) a test cartridge inserted into the instrument to obtain a test signal; and
(ii) the embedded normalization target to obtain a current normalization value; and
optionally adjusting the test signal by a scaling factor based on the current normalization value, thereby obtaining a scaled test result with improved precision relative to test signal.
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Abstract
Disclosed herein is a method for improving the precision of a test result from an instrument with an optical system that detects a signal. The method comprises including in the instrument a normalization target disposed directly or indirectly in the optical path of the optical system. Also disclosed are instruments comprising a normalization target, and systems comprising such an instrument and a test device that receives a sample suspected of containing an analyte.
58 Citations
19 Claims
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1. A method to improve precision of a test result from an optical instrument previously calibrated with an external calibrant and having stored in instrument memory a calibration value, comprising:
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providing the optical instrument comprising a normalization target embedded in or on the instrument, the normalization target having an assigned normalization value based on its detected signal relative to detected signal associated with the calibration value, the assigned normalization value stored in instrument memory; inserting an external calibrant into the instrument; collecting light emission data from the external calibrant and from the embedded normalization target in a single scan or image; assigning an updated normalization value to the embedded normalization target; scanning or imaging in a single scan; (i) a test cartridge inserted into the instrument to obtain a test signal; and (ii) the embedded normalization target to obtain a current normalization value; and optionally adjusting the test signal by a scaling factor based on the current normalization value, thereby obtaining a scaled test result with improved precision relative to test signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A method to improve precision of a test signal from an optical instrument previously calibrated with an external calibrant and having stored in instrument memory a calibration value, comprising:
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providing the optical instrument comprising a normalization target embedded in or on the instrument, the normalization target having an assigned normalization value based on its detected signal relative to detected signal associated with the calibration value, the assigned normalization value stored in instrument memory; scanning or imaging in a single scan; (i) a test cartridge inserted into the instrument to obtain a test signal; and (ii) the embedded normalization target to obtain a current normalization value; and optionally adjusting the test signal by a scaling factor based on the current normalization value, thereby obtaining a scaled test result with improved precision relative to test signal. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18, 19)
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Specification