You have posted on the wrong site. Questions about HIV testing and prevention need to be posted on the HIV Prevention site.
The CDC's statements are outdated and currently are being re-considered (I am on a committee which has raised this question). I am not sure what you mean be an imca assay but, if it is an FDA-approved test performed here in the United States, the result you have is reliable. You do not need further testing, you do not have HIV. EWH