I read somewhere that riba confirmatory hepatatis c test is not used anymore.What hepatatis c test is now used, instead of riba, to differentiate between false positive hepatatis c antibody and remote hepatatis c infection that has cleared on its own without any treatment? In other words what follow up hepatatis c test is now used in situation like this: hepatatis c antibody is positive or reactive, but HCV RNA PCR is negative or non reactive(if one wants know if hepatatis c antibody test was false positive or had remote hepatatis c infection that has cleared on its own without any treatment)?