The Gastroenterology Group is a group of gastroenterology and hepatology specialists focused on delivering evidence-based, personalised care.
Our Doctors
Dr Gwee Kok Ann
Gastroenterologist and Physician
Gleneagles Hospital
Adjunct Associate Professor of Medicine
National University of Singapore
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Professional Qualifications
MBBS (Singapore)
M Med (Internal Medicine)
MRCP (UK)
PhD (Sheffield)
FAMS (Gastroenterology)
FRCP (London & Glasgow)
Gwee Kok Ann, MBBS, FAMS (Gastroenterology), FRCP, PhD, practices at Gleneagles Hospital. He obtained his medical degree from National University of Singapore in 1985, completed his gastroenterology training at National University Hospital, Singapore, undertook further training in UK and Canada, and was awarded a PhD from University of Sheffield for his thesis on Post-infectious IBS.
He is a leading authority on irritable bowel syndrome (IBS) and constipation, being the lead author of position papers on IBS, use of probiotics for digestive disorders, dyspepsia and constipation. He was a member of the Rome Committee that publishes international guidelines for research and management of functional GI disorders, past president of the IBS Support Group (a patient self-help group), the ANMA (an Asian expert panel organisation dedicated to the science and practice of neurogastroenterology and motility), and recipient of the Rome Foundation Research Award 2014.
Dr Gwee is also Adjunct Associate Professor of Medicine at the National University of Singapore. Professor Gwee has international publications on the role of probiotics in clinical management, post-infectious IBS, the roles of melatonin, sleep disturbance and gluten sensitivity in IBS, endoscopic evaluation of gastro-esophageal reflux disease, and the effect of Helicobacter pylori treatment in dyspepsia. In addition to the management of stomach, liver and bowel disorders, Dr Gwee provides expertise in the management of dyspepsia, indigestion, gas related complaints, bowel habit training and dietary management of food intolerance, refractory GERD and H pylori infection, and small intestinal bacterial overgrowth. His specific hepatology interests are the management of fatty liver and hepatitis E.
Dr Roland Chong Siong Eng
Gastroenterologist &
Physician​
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Professional Qualifications
MBBS (Singapore)
M Med (Internal Medicine, Singapore)
MRCP (UK)
MRCP (Ireland)
FRCP (Ireland & Edinburgh)
FAMS (Gastroenterology)
Dr Chong is a Consultant Gastroenterologist at Gleneagles Hospital. He graduated from the university of Singapore in 1980 and obtained post-graduate degrees in internal medicine in 1985/86 from the Royal college of Physicians of UK, Ireland and National University of Singapore. He was subsequently conferred fellowships by the Irish and Edinburgh Colleges and is a fellow of the Academy of Medicine Singapore.
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Dr Chong spent a year in Edinburgh on HMDP fellowship under the auspices of the Ministry of Health and Royal college of Physicians of Edinburgh in the GI/Liver Service. While in SGH, he served as the director of the Endoscopy Centre and served on Post Graduate education committee, the standing advisory committee, the SGH Post Graduate Medical Institute and the credentialling committee. His research interests while in SGH centred around hepatology and he won the Inaugural Young Investigators Prize for the Best Paper ”The Relationship between Alcohol, lipids and Apolipoproteins” at the Biennial Scientific Association for the Study of the Liver, Jakarta 1990.
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Despite leaving for private practice in 1996, he continued to contribute to teaching and training in Gastroenterology and has been visiting consultant to the Department of Gastroenterology since 1996 and Department of Internal Medicine SGH from 2013-2021. He was also a member of the specialist training committee, Specialist Accreditation Board in Gastroenterology , Ministry of Health and a member of the National Advisory Committee on Gastroenterology, Ministry of Health.
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A thought leader in his field, he chaired several Ministry of Health guideline committees, including the inaugural Clinical Practice Guidelines (CPG) on use of Antibiotics in Adults Year 2002 and Co- Chaired CPG on Management of Hepatitis B, as well as served as a member for the CPG guidelines on use of Steroids in general Practice. He was a Member of the Medical Expert Panel for the Subordinate Courts Mediation Service and is presently in the Panel of Medical Assessors to the Supreme Court as appointed by the Singapore Medical Council.
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He also contributed to the local gastroenterology community by serving as the president of the Gastroenterologic Society of Singapore (GESS) and as an executive committee member, Asia Pacific Association for Gastroenterology. He also was a previous Chair of the Chapter of Gastroenterologist, College of Physicians, Academy of Medicine Singapore.
Having accumulated years of practice and experience, he manages patients holistically with an eye to all their problems and with an understanding that certain things will need other subspeciality care.
Dr Lui Hock Fong
Gastroenterologist & Physician
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Professional Qualifications
MBBS (Singapore)
MRCP (UK)
FAMS (Gastroenterology)
FRCP (Edinbrugh)
Dr Lui graduated first in class in the final MBBS exams from the National University of Singapore. He then underwent Internal Medicine Specialist Training under the Ministry of Health Singapore attaining membership at the Royal Colleges of Physicians of England in 1994 and went on to train in
Gastroenterology, Hepatology and Transplant Hepatology at the Royal Infirmary of Edinburgh, The
Scottish Liver Transplant Unit and the Lister Postgraduate Institute of the University of Edinburgh
and spent a year at the Chelsea and Westminster Hospital, London. He returned to Singapore and
took up position at the Singapore General Hospital before leaving as senior consultant in 2006 to
start his present practice at Gleneagles Hospital.
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Dr Lui’s practice involves looking after individuals with general digestive and liver diseases, complex liver diseases and liver cirrhosis, liver transplantation. He performs diagnostic and therapeutic endoscopy. He serves as Visiting Consultant with 1) Singapore General Hospital, 2) Ni Ni Lab & Medical Centre, Myanmar (registered with the Myanmar Medical Council) and previously 3) Kobe International Foundation Medical Centre, Japan. in Kobe. He was Medical Director of the Mt Elizabeth Liver Transplant Programme. He in conversant in English, Mandarin, Malay, Bahasa Indonesia and dialects of Cantonese and Hokkien.
Dr Lui is active in local and international forums of Gastroenterology where he regularly delivers
lectures, holds executive positions (currently Secretary of The Asian GI Faculty, previously Chairman of the National Foundation of Digestive Disease, Secretary of the Chapter of Gastroenterology of the Academy of Medicine of Singapore, Scientific Chairman of the Gastroenterological Society of Singapore, and Editor of its Publication, GutViews), and was appointed by the Ministry of Health Singapore, the Asia Pacific Association for Study of Liver to formulate Expert Treatment Guidelines for treatment of Hepatitis B, Liver Cancer and Complications of Liver Cirrhosis.
Dr Calvin Koh Jianyi
Gastroenterologist and Physician
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Professional Qualifications
MBBS (Singapore)
M Med (Internal Medicine)
MRCP (UK)
FRCP (London)
FAMS (Gastroenterology)
Dr Calvin Koh is a gastroenterologist practicing at Gleneagles Hospital, Singapore. He obtained his medical degree (MBBS) from the National University of Singapore (NUS) and underwent further medical training at the National University Hospital (NUH), where he subsequently obtained his specialist accreditation from the Specialist Accreditation Board (SAB) of Singapore and is a fellow of the Academy of Medicine Singapore.
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Following completion of specialist training, he was awarded an Academic Medicine Development Award and undertook an advanced endoscopy fellowship under the auspices of the American Society for Gastrointestinal Endoscopy (ASGE) with the Division of Gastroenterology, Hepatology and Nutrition at the University of Florida, USA to further his interest in interventional endoscopy.
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Prior to joining The Gastroenterology Group, he was senior consultant at NUH, where he also served as director of endoscopy, as well as an assistant professor at the NUS Yong Loo Lin School of Medicine with clinical and research interests in endoscopy, pancreatobiliary disease, gastric and colon cancer, with more than 50 academic papers in these fields in regional and international scientific journals. He is also faculty for local and regional gastroenterology conferences.
He is a fellow of the Royal College of Physicians (FRCP) (London), as well as the American Society of Gastrointestinal Endoscopy (FASGE), and a current committee member of the chapter of Gastroenterology in the College of Physicians at the Academy of Medicine, Singapore
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Besides gastroscopy and colonoscopy, he also performs endoscopic ultrasound (EUS), endoscopic retrograde cholangiopancreatography (ERCP), small bowel enteroscopy, radiofrequency ablation of Barretts dysplasia, percutaneous endoscopic gastrostomy and nasojejunal feeding tube placements as well as endoscopic mucosal resection of colon polyps.