After 4 months cd4 is 488 and hiv elisa,rapid,p24combo are negative and hiv rna quantitative real time pcr is target not detected.it is 100% negetive?

Yes: Consider yourself healthy. Nobody even knows the false-negative rate for these tests beyond this time, because people who turn up positive later could well be fibbing about the time of exposure. Hey, man.... You've been through a rough time and I'm glad you're okay. But whatever happened, I hope you'll cherish the memory of loving and having been loved. Be wise from now on. Best wishes.

As near 100% as: practical. If the HIV RNA test is negative at 4 months after exposure that is as close to 100% as you can get. I trust that you did not have more exposures to HIV.