Device for measuring an analyte
A novel method for detecting the concentration of a metabolite in a fluid sample is provided. Devices for the detection of the analyte are also provided. In particular, a device for determining the concentration of 11-dehydro thromboxane in a urine sample and comparing it to a set of standardized quartile concentrations is provided. A concentration of urinary 11-dehydro thromboxane that falls within the fourth quartile is indicative of a greatly increased risk of a recurrent cardiovascular event.
1. An immunoassay kit for detecting an analyte in a test sample, comprising:
i. a first strip including a test patch that contains a predetermined amount of an antibody specifically binding to the analyte, wherein the antibody is linked to a reporter molecule capable of releasing a signal, and
ii. a second strip made of an absorbent material for absorbing the test sample the second strip being configured to be separable from the first strip,
wherein after contacting the first strip for a fixed time period with the second strip absorbed with the test sample and then separating them, the antibody bound to the analyte moves from the first strip to the second strip and the antibody not bound to the analyte remains on the first strip, the level of signal released from the reporter molecule linked to the antibody remaining on the first strip being inversely proportional to the amount of the analyte in the test sample.
2. The immunoassay kit of claim 1 , wherein the first strip further includes four reference patches containing four predetermined amounts of the reporter molecule, the levels of signal released therefrom corresponding to four determined concentrations of the analyte.
3. The immunoassay kit of claim 1 , wherein the reporter molecule is a dye.
4. The immunoassay kit of claim 1 , wherein the reporter molecule is an enzyme.
5. The immunoassay device according to claim 1 , wherein the antibody binds to thromboxane B2.
6. The immunoassay kit according to claim 5 , wherein the first strip further includes four reference patches containing four predetermined amounts of the reporter molecule, the level of signal released therefrom corresponding to relative risks of a cardiovascular event.
7. The immunoassay kit according to claim 6 , wherein the levels of signal released from the four predetermined amounts of the reporter molecule correspond to the following four amounts of urinary 11-dehydro thromboxane B2: (i) less than 15.1 ng/mmol creatinine, (ii) 15.1-21.8 ng/mmol creatinine, (iii) 21.9-33.8 ng/mmol creatinine, and (iv) higher than 33.8 ng/mmol creatinine.
8. The immunoassay kit according to claim 6 , wherein the reporter molecule is a dye.
9. The immunoassay kit according to claim 6 , wherein the reporter molecule is an enzyme.