Immunoassay detection device with test strip accommodated in a capillary tube

1. A method for analysing an analyte using a test device, wherein the test device comprises:

a capillary tube; and

a test strip which is flexibly accommodated in the capillary tube and lines the inner wall of the capillary tube, the test strip having:

a control zone on to which a probe capture ligand is immobilized,

a first major surface on which two or more test zones are defined,

a first test zone having immobilised thereon a first analyte specific antibody adapted to bind to a first capture target on a first analyte,

a second test zone having immobilised thereon, a second analyte-specific antibody adapted to bind to a second capture target on a second analyte, and

a test strip holding tab, wherein the method comprises the steps of:

exposing the test device to sample containing the first analyte such that the first analyte becomes bound to the first analyte specific antibody on the first test zone on the test device, washing the test device to remove unbound analyte, exposing the test device to a detection solution comprising at least one labelled probe adapted to bind to the first analyte, washing the test device to remove unbound probe, and observing the presence of bound probe at the first test zone.

2. The method according to claim 1 comprising the step of exposing the test device to a detection solution comprising a labelled probe adapted to bind to probe targets on each of two or more analytes.

3. The method according to claim 1 comprising the step of exposing the test device to a detection solution containing a labelled probe adapted to bind selectively to a probe target on a single analyte.

4. The method according to claim 1 comprising the further steps of: introducing the sample into a container comprising the test device and incubating the sample in contact with the first major surface of the test device and washing the first major surface of the device with a wash solution.

5. The method according to claim 1 comprising the further step of observing the control zone to check that labelled probe has been captured at the control zone.

6. The method according to claim 1 comprising the further step of using a reader to measure the presence or quantity of bound labelled probe.

7. The method according to claim 1 comprising washing the test strip and exposing it to a detection solution comprising a labelled probe.

8. The method according to claim 1 comprising the step of incubating the sample in contact with the first surface of the test device for an incubation time.

9. The method according to claim 8 wherein the incubation time is in the range 1 minute to 1 hour.

10. The method according to claim 8 wherein the incubation time is between 2 and 30 minutes.