Is repetitive hiv pcr rna ( not detected) at 1, 3-1/2 month, hiv antibody(negative) at 3-1/2, 6,7-1/2 month rule out hiv infection ??

Quite accurate: At the six month mark more than 99.9% of patients who have contracted HIV will produce HIV antibodies. Also if you persistently have nondetectable HIV viral loads, the combination of the two suggest that you have essentially ruled out the possibility of HIV infection. If you still have concerns, you should review your testing with your physician. Hope this helps.

Rules out infn but..: Depending on frequency engaging in activities that places you at higher risk of getting HIV infection, then once every 3-6 months is acceptable. Also, there are two types of HIV that infect humans (HIV-1 and HIV-2). Depending on where you live, HIV-2 may be present. Many tests for both, but some don't necessarily test for HIV-2. Check with your doctor if this is a possibility.