<qa>  What is the ability of Methcetin BreathID Test to detect patients who willA relatively large proportion of patients with chronic HCV infection have normal or mildly elevated ALT. Many of these patients are not being treated, and are not being sent for a liver biopsy. The present study will determine the ability of Methcetin BreathID TestMBIT to detect those patients who will be candidates for anti-viral treatment, as an alternative measure for liver biopsy in decision-making prior to treatment in clinical hepatology. 