Assay with increased dynamic range
First Claim
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1. A kit comprising:
- i) a first analyte-binding molecule comprising a first label;
ii) a second analyte-binding molecule comprising a second label, wherein the binding affinity for the analyte of the first analyte-binding molecule is greater than that of the second analyte-binding molecule;
iii) a third analyte-binding molecule attached to a solid support, wherein the third analyte-binding molecule can bind to analyte concurrently with either the first analyte-binding molecule or the second analyte-binding molecule;
wherein the solid support comprises two or more spatially separated electrodes, wherein the solid support is contained in a handheld point-of-care device.
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Abstract
Provided herein are assays and kits useful for avoiding “prozone phenomenon” or “hook effect” and which expand the range of accurately measurable analyte concentrations.
40 Citations
28 Claims
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1. A kit comprising:
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i) a first analyte-binding molecule comprising a first label; ii) a second analyte-binding molecule comprising a second label, wherein the binding affinity for the analyte of the first analyte-binding molecule is greater than that of the second analyte-binding molecule; iii) a third analyte-binding molecule attached to a solid support, wherein the third analyte-binding molecule can bind to analyte concurrently with either the first analyte-binding molecule or the second analyte-binding molecule;
wherein the solid support comprises two or more spatially separated electrodes, wherein the solid support is contained in a handheld point-of-care device. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A method of expanding the dynamic range of an assay, comprising:
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a) contacting a test sample suspected of comprising an analyte with a first analyte-binding molecule comprising a first label, a second analyte-binding molecule comprising a second label and a third analyte-binding molecule attached to a solid support under conditions that allow binding of; (i) the first analyte-binding molecule and the third analyte-binding molecule and (ii) the second analyte-binding molecule and the third analyte-binding molecule to the analyte, wherein the binding affinity for the analyte of the first analyte-binding molecule is greater than that of the second analyte-binding molecule, wherein the first analyte-binding molecule and the second analyte-binding molecule do not concurrently bind to the analyte; b) measuring the signal intensities of the first label of the first analyte-binding molecule bound to the analyte and of the second label of the second analyte-binding molecule bound to the analyte; and c) determining the concentration of analyte by comparing the signal intensities of the first label and the second label, wherein step b) of measuring the signal intensities of the first label of the first analyte-binding molecule bound to the analyte and the signal intensity of the second label of the second analyte-binding molecule bound to the analyte is done in a calibration assay over a predetermined range of analyte concentrations, and the method further comprises the step of; d) establishing a flag value by determining a ratio of the signal intensity of the first label of the first analyte-binding molecule bound to the analyte and the signal intensity of the second label of the second analyte-binding molecule bound to the analyte in the calibration assay or the inverse of this ratio at or near the concentration of analyte that provides maximum signal intensity of the first label of the first analyte-binding molecule bound to the analyte. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28)
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Specification