You dont need testing. Oral sex does not transmit hiv. I realize you said you need this for the psychological reasurrance but rna by pcr or dna by pcr are not approved diagnostic tests and have produced false positives do to their sensitivity. Which in your case with the ocd it would probably push you over the edge. If you insist on testing a single antibody test three months post exposure is when tou can obtain a conclusive result
The DNA by PCR is a viral load test--the RNA by PCR is an accurate test at around 2 to 4 weeks after exposure.
Neither the Abbott RealTime nor the Roche COBAS AmpliPrep/COBAS TaqMan HIV-1 assay is intended to be used as a donor screening test for HIV-1 or as a diagnostic test to confirm the presence of HIV-1 infection.
HIV/AIDS Program Director
Office of Special Health Issues
Food and Drug Administration
PCR-RNA tests are supplemental tests that have to be used in conjunction with an antibody test. They are not stand-alone tests.