The FDA states that the OraQuick test is 92% sensitive to HIV antibodies. This means that this oral test would return a false negative in 1 out of 12 tests.
The organization goes on to state that this particular test has 99.98% specificity, which means that 1 in 5,000 tests will return a false positive.
However, a test's accuracy depends on whether a person has HIV antibodies present. While these antibodies can take up to 6 months to develop, up to 97% of people will have HIV antibodies within 3 months of contracting HIV.