Test strip for a lateral flow assay for a sample containing whole cells
First Claim
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1. A test strip comprising(a) a first membrane comprising a chromatographic strip having a reaction region, a first position, a second position and a third position;
- (b) a first sample filter at the first position and having an upper surface and a lower surface, wherein the lower surface of the sample filter is in capillary contact with the chromatographic strip;
(c) a conjugate pad at the second position and having an upper surface and a lower surface, wherein the lower surface of the conjugate pad is in capillary contact with the chromatographic strip; and
(d) an absorbent pad at the third position wherein the absorbent pad is in capillary contact with the chromatographic strip when a sample is added to the sample filter, wherein the sample filter is capable of separating cells in the sample from fluid in the sample and allows the fluid to pass through to the chromatographic strip, wherein the first and second positions are on opposite sides of the reaction region, wherein the test strip facilitates lateral flow of fluid from the sample filter towards the reaction region and from the conjugate pad towards the reaction region, and wherein (i) the first position and the third position are on opposite sides of the second position, or (ii) the second position and the third position are on opposite sides of the first position.
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Abstract
A test strip for conducting a lateral flow assay for detection of an analyte in a sample that contains cells and fluid is provided, as well as methods for making and using the test strip. This test strip is commercially usable, for example, in a diagnostic device at a point of care for detection of analytes in whole blood.
76 Citations
32 Claims
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1. A test strip comprising
(a) a first membrane comprising a chromatographic strip having a reaction region, a first position, a second position and a third position; -
(b) a first sample filter at the first position and having an upper surface and a lower surface, wherein the lower surface of the sample filter is in capillary contact with the chromatographic strip; (c) a conjugate pad at the second position and having an upper surface and a lower surface, wherein the lower surface of the conjugate pad is in capillary contact with the chromatographic strip; and (d) an absorbent pad at the third position wherein the absorbent pad is in capillary contact with the chromatographic strip when a sample is added to the sample filter, wherein the sample filter is capable of separating cells in the sample from fluid in the sample and allows the fluid to pass through to the chromatographic strip, wherein the first and second positions are on opposite sides of the reaction region, wherein the test strip facilitates lateral flow of fluid from the sample filter towards the reaction region and from the conjugate pad towards the reaction region, and wherein (i) the first position and the third position are on opposite sides of the second position, or (ii) the second position and the third position are on opposite sides of the first position. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24)
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25. A test strip comprising
(a) a chromatographic strip having a reaction region, a first position and second position; -
(b) a selective membrane; (c) a sample filter at the first position and having an upper surface and lower surface; (d) a conjugate pad at the second position and having an upper surface and a lower surface, wherein the lower surface of the conjugate pad is in capillary contact with the chromatographic strip; and (e) an absorbent pad at a third position, wherein the absorbent pad is in capillary contact with the chromatographic strip when a sample is added to the sample filter, wherein the sample filter is capable of separating cells in the sample from fluid in the sample and allows the fluid to pass through to the chromatographic strip, wherein the first and second positions are on opposite sides of the reaction region, wherein the selective membrane is in capillary contact with the sample filter and the chromatographic strip, wherein the test strip facilitates lateral flow of fluid from the selective membrane towards the reaction region and from the conjugate pad towards the reaction region, and wherein (i) the first position and the third position are on opposite sides of the second position, or (ii) the second position and the third position are on opposite sides of the first position.
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26. A test strip comprising:
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(a) a chromatographic strip having a reaction region; (b) a sample filter having an upper surface and lower surface; (c) a sample pad in capillary contact with the chromatographic strip and the lower surface of the sample filter; (d) a conjugate pad having an upper surface and a lower surface, wherein the lower surface of the conjugate pad is in capillary contact with the chromatographic strip; and (e) an absorbent pad, wherein the absorbent pad is in capillary contact with the chromatographic strip when a sample is added to the sample filter, wherein the sample filter is capable of separating cells in the sample from fluid in the sample and allows the fluid to pass through to the chromatographic strip, wherein the conjugate pad and the sample pad are on opposite sides of the reaction region, wherein the test strip facilitates lateral flow of fluid from the sample pad towards the reaction region, and wherein (i) the sample filter and the absorbent pad are on opposite sides of the conjugate pad, or (ii) the conjugate pad and the absorbent pad are on opposite sides of the sample filter.
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27. A test strip comprising:
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(a) a chromatographic strip having a reaction region, a first position and second position; (b) a sample filter at the first position and having an upper surface and lower surface; (c) a sample pad having an upper surface and a lower surface, wherein the sample pad is in capillary contact with the chromatographic strip and the upper surface of the sample pad is in capillary contact with the lower surface of the sample filter; (d) a conjugate pad at the second position and having an upper surface and a lower surface, wherein the lower surface of the conjugate pad is in capillary contact with the chromatographic strip; and (e) an absorbent pad at a third position, wherein the absorbent pad is in capillary contact with the chromatographic strip when a sample is added to the sample filter, wherein the sample filter is capable of separating cells in the sample from fluid in the sample and allows the fluid to pass through to the chromatographic strip, wherein the first and second positions are on opposite sides of the reaction region, wherein the test strip facilitates lateral flow of fluid from the sample pad towards the reaction region and from the conjugate pad towards the reaction region, and wherein (i) the first position and the third position are on opposite sides of the second position, or (ii) the second position and the third position are on opposite sides of the first position. - View Dependent Claims (28)
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29. A test strip comprising
(a) a chromatographic strip having a reaction region, a first position and second position; -
(b) a sample filter at the first position and having an upper surface and lower surface; (c) a selective membrane and a sample pad, wherein the selective membrane is either; (i) in capillary contact with the sample filter and the sample pad, or (ii) in capillary contact with the sample pad and the chromatographic strip; and wherein the sample pad has an upper surface and a lower surface, wherein the sample pad is (i) in capillary contact with the chromatographic strip if the selective membrane is in capillary contact with the sample filter and the sample pad, or (ii) in capillary contact with the lower surface of the sample filter if the selective membrane is in capillary contact with the sample pad and the chromatographic strip; (d) a conjugate pad at the second position and having an upper surface and a lower surface, wherein the lower surface of the conjugate pad is in capillary contact with the chromatographic strip; and (e) an absorbent pad at a third position, wherein the absorbent pad is in capillary contact with the chromatographic strip when a sample is added to the sample filter, wherein the sample filter is capable of separating cells in the sample from fluid in the sample and allows the fluid to pass through to the chromatographic strip, wherein the first and second positions are on opposite sides of the reaction region, wherein the test strip facilitates lateral flow of fluid from the first position towards the reaction region and from the conjugate pad towards the reaction region, and wherein (i) the first position and the third position are on opposite sides of the second position, or (ii) the second position and the third position are on opposite sides of the first position. - View Dependent Claims (30, 31, 32)
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Specification