I am not familiar with the combi pt ecl test that as far as I know is not actest for hepatitis C. The test for hepatitis C is the hepatitis C antibody test. Are you asking about a different form of hepatitis like hepatitis A or hepatitis B?
The test for hepatitis C antibodies unless your immune system is compromised is definitive after 12 weeks.
For questions about HIV ask in that forum. For other forms of hepatitis ask in the associated forum.
Or for an answer from a medical professional as opposed to lay persons with no medical training ask your personal doctor.
Which hepatitis are you asking about? This is the hepatitis C forum. I see your other question was about hepatitis A