Principle of the procedure
The assay starts with a sample and diluent applied to the respective well. The HIV antigen-colloidal gold conjugate embedded in the sample pad reacts with the HIV antibody present in blood, serum or plasma sample forming conjugate/HIV antibody complex.
As the mixture is allowed to migrate along the test strip, the conjugate/HIV antibody complex is captured by a second antibody immobilized on a membrane forming a colored test band in the test region. A negative sample does not produce a test band due to the absence of colloidal gold conjugate/HIV antibody complex.
The antigens used in the conjugate test are recombinant proteins that correspond to highly immunoreactive regions of HIV1 and HIV2. A colored control band in the control region appears at the end of test procedure regardless of test result.
This control band is the result of colloidal gold conjugate binding to the anti-HIV antibody immobilized on the membrane. The control band indicates that the colloidal gold conjugate is functional.
Notice to the testing result
Negative: Due to the window period, negative result does not guarantee there is no HIV antibody in low concentration. Thus the test should be repeated in 16 days.
Positive: Please consult medical attention at once.
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