Ahmad, JawadReddy, K. RajenderTillmann, Hans L.Hayashi, Paul H.Chalasani, NagaFontana, Robert J.Navarro, Victor J.Stolz, AndrewBarnhart, HuimanCloherty, Gavin A.Hoofnagle, Jay H.2021-05-042021-05-042019-03-29Ahmad, J., Reddy, K. R., Tillmann, H. L., Hayashi, P. H., Chalasani, N., Fontana, R. J., Navarro, V. J., Stolz, A., Barnhart, H., Cloherty, G. A., & Hoofnagle, J. H. (2019). Importance of Hepatitis C Virus RNA Testing in Patients with Suspected Drug-Induced Liver Injury. Digestive Diseases and Sciences, 64(9), 2645–2652. https://doi.org/10.1007/s10620-019-05591-w1573-2568https://hdl.handle.net/1805/25863Background & Aims: The aims were to review the diagnosis, testing and presentation of acute hepatitis C (HCV) in patients initially diagnosed to have drug-induced liver injury (DILI) enrolled in the US DILI Network. Methods: All patients with suspected DILI underwent testing for competing causes of liver injury and returned for 6-month follow-up. Causality was adjudicated by consensus expert opinion. Results: Between 2004–2016, 1518 patients were enrolled and adjudicated and underwent 6 months of follow up. Initial locally acquired anti-HCV results were available in 1457 (96%), but HCV RNA in only 795 (52%). Stored sera were available for repeat testing, so that results were available on all 1518 patients (1457 for anti-HCV and 1482 for HCV RNA). 104 subjects (6.9%) had evidence of HCV infection- 10 positive for HCV RNA alone, 16 for anti-HCV alone and 78 for both. All 104 HCV-positive cases were reviewed and 23 cases were adjudicated as acute HCV. All presented with acute hepatocellular injury with median ALT 1448 U/L, alkaline phosphatase 232 U/L and total bilirubin 10.8 mg/dL. 22 (96%) patients were jaundiced. While all 23 cases initially had been suspected of having DILI, 19 were adjudicated as acute HCV and not DILI at the 6 month follow-up; while 4 were still considered DILI. Conclusions: 23 of 1518 (1.5%) cases of suspected DILI were due to acute HCV infection. We recommend that initial and follow up HCV RNA testing should be performed to exclude HCV in patients with acute hepatocellular injury and suspected DILI.en-USDrug induced liver injuryacute hepatitis Chepatitis C RNAArticle