Hi . We are not medical experts, but, from what I know and have read, the longest it should take for hep C to show up in blood tests in nine months after exposure and that is in the rarest of cases. Usually, you will get a positive result within four weeks to six months. I would ask your doctor to be sure, but you should be in the clear if it's been three years. Definitely a reason to celebrate! Best of all wishes. - Lori (Team Member)