Neg 4 hiv 1 yr after exposure but my wbc keep going down my wbc is now 6.1 from 7.2 range 3.5- 10.0 my cd4/cd8 ratio 1.85 range 0.9-3.72 have symptoms number of neg hiv test over 1 yr exposure. can hiv take longer than 1 yr to be detected. more test?

There can be a window period up to three months between getting infected with HIV and testing positive. I have not heard of a case that did not show up for a year. 6.1 WBC count is within normal range. There will be some fluctuation with all tests which is normal. I don't think it is likely you have HIV (however, it is possible a test could be wrong). If you're still worried then test again.