Our expert says:
Clinical studies showed that the sensitivity and the specificity of rapid HIV tests are comparable other tests often used for screening. The negative predictive value of a screening test is high thus, a patient with a NEGATIVE rapid HIV test result can be sure he or she is NOT infected BUT HIV antibodies take time to develop, and retesting is recommended if you were exposed within the last 3 months.
It may also happen that some results may be false-positive, in which case the rapid test must be confirmed by a supplemental test e.g. Western blot.
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