Prof. Dr. Oya Yönal
Gastroenterology
About Oya Yönal
Prof. Oya Yönal is a gastroenterologist with specialized training in gastroenterology from Marmara University Faculty of Medicine (2010). With a clinical appointment at Acibadem Health Group since 2020, she focuses on the diagnosis and management of complex digestive diseases, including inflammatory bowel disease and liver disorders. An active member of national and international professional societies, she belongs to the Inflammatory Bowel Diseases Association, ECCO (European Crohn’s and Colitis Organization), the Turkish Association for Liver Research, and the Turkish Liver Foundation. She also serves on the Istanbul Branch Board of the Turkish Gastroenterology Association, contributing to education, clinical standards, and professional development within the field. Her practice emphasizes evidence-based care, multidisciplinary collaboration, and patient-centered management for chronic gastrointestinal and hepatologic conditions.
Subspecialties
- Inflammatory bowel disease
- Ulcerative colitis
- Ulcerative proctitis
- Nonalcoholic fatty liver disease
- Nonalcoholic steatohepatitis
- Liver fibrosis
- Chronic liver disease
- Primary malignant melanoma of the esophagus
Education
- 2010 Marmara University Faculty of Medicine Gastroenterology
- 2006 Istanbul University Istanbul Faculty of Medicine Internal Medicine
- 2001 Istanbul University Faculty of Medicine
Experience
- 2020 Acibadem Health Group
- 2020 GelisimUniversity / Memorial Şişli Hospital / Gastroenterology / Prof. Dr.
- 2014 Memorial Sisli Hospital / Gastroenterology / Assoc. Dr.
- 2011 – 2014 Memorial Sisli Hospital / Gastroenterology / Specialist Dr.
- 2007 – 2010 Marmara University Faculty of Medicine / Gastroentereology / Research Assistant / Specialist Dr.
- 2001 – 2006 Istanbul University Faculty of Medicine / Internal Medicine / Research Assistant
Professional Memberships
- Inflammatory Bowel Diseases Association
- ECCO (European Crohn’s and Colitis Organization)
- Turkish Association for Liver Research
- Turkish Gastroenterology Association (Istanbul Branch Board Member)
- Turkish Liver Foundation
Selected Publications
- No association between the functional cannabinoid receptor type 2 Q63R variants and inflammatory bowel disease in Turkish subiects Türk J Gastroenterol (ISI),Vol 25,639- 43pp, 2014 Yonal O, Eren F, Yilmaz Y, Atug Ö, Över HEL
- Primary malignant melanoma of the esophagus. Case Reports in Gastroenterology (ISI), Vol. 7, 272-6 pp., 2013 Yonal O, ibrisim D, Songur Y, Cakaloglu Y, Tuncer K, Kirimlioglu H, Ozdil S.
- Effects of sitagliptin in diabetic patients with nonalcoholic steatohepatitis Açta Gastroenterologica Belgica (ISI). Vol. 75,240-4 pp.,2012 Yilmaz Y, Yonal O, Deyneli O, Celikel CA, Kalayci C, Duman DG.
- Should maintenance therapy be performed in ulcerative proctitis? How long should it be continued? Turkish Journal of Gas t roentero 1 ogy (ISf f Ci 11 23, 21-4 pp., 2012 Yönal O, Hatemi G, Kaymakoglu S.
- Do anti-TNF agents and combination treatment increase pöstoperative complication risk? Turkish Journal of GastroenterologyflSD. Vol. 23, 25-9 pp., 2012 Yönal O, Hatemi G, Hamzaoğlu Ö.
- Serum galectin-3 levels in patients with nonalcoholic fatty liver disease Clinical Biochemistry (ISI), Vol. 44, 955-8 pp.,2011 Yilmaz Y, Eren F, Kurt R, Yonal O, Polat Z, Senates E, Bacha M, Imeryuz N
- Serum levels of soluble receptor for advanced glycation endproducts (sRAGE) are higher in ulcerative colitis and correlate with disease activity Journal of Crohn?s and Colitis aSF). Vol. 5,402-6 pp.,2011 Yilmaz Y, Yonal O, Eren F, Atug O, Över Hamzaoglu H
- Circulating vaspin levels and epicardial adipose tissue thickness are associated with impaired coronary flow reserve in patients with nonalcoholic fatty liver disease Atherosclerosis(ISI), Vol. 217,125-9 pp.,2011 Yilmaz Y, Kurt R, Gurdal A, Alahdab YO, Yonal O, Senates E, Polat N, Eren F, Imeryuz N, Oflaz H.
- Serum progranulin as an independent marker of liver fibrosis in patients with biopsy-proven nonalcoholic fatty liver disease Disease Markers (ISI), Vol. 31, 205-10 pp., 2011 Yilmaz Y, Eren F, Yonal O, Polat Z, Bacha M, Kurt R, Ozturk O, Avsar E.
- Noninvasive assessment of liver fibrosis with the aspartate transaminase to platelet ratio index (APRI): Usefulness in patients with chronic liver liver disease. Hepatitis Monthlv (ISIT Vol. 11, 103-6 pp.,2011 Yilmaz Y, Yonal O, Kurt R, Bayrak M, Aktas B, Ozdogan O
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