About Dr Calvin Ong

Dr Calvin Ong

mbbs | M.Med (Surgery) | MRCS | FRCS

Dr. Calvin Ong is a Senior Consultant with more than 15 years of surgical experience. He specializes in colorectal and general surgery, performing minimally invasive as well as advanced robotic surgeries for benign and malignant colorectal conditions, including inflammatory bowel disease, pelvic floor disorders, colorectal cancer, and hernia repair. He is dedicated to providing high-quality, personalised care for his patients.

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Professional & Academic Experience

Senior Consultant, General and Colorectal Surgeon, Colorectal Clinic Associates (Current Position)
Clinical Lecturer, NUS Yong Loo Lin School of Medicine
Clinical Lecturer, NTU Lee Kong Chian School of Medicine
Former Physician Faculty Member, SingHealth General Surgery Residency Program
Clinical Associate Professor, NUS Yong Loo Lin School of Medicine
Visiting Consultant, Changi General Hospital

Professional Membership

Member, Society of Colorectal Surgeons of Singapore
Former Executive Committee Member, Society of Colorectal Surgeons of Singapore

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Dr Calvin Ong Jianming

Senior Consultant, Colorectal & General Surgeon

MBBS (S’pore)|

M.Med (Surgery)|

MRCS (Ireland)|

FRCS (Edin)|

王健名医生

Dr. Ong graduated with a Bachelor’s degree in medicine and surgery from the National University of Singapore in 2008 and completed his Masters of Medicine (Surgery) at the same institute. He finished his advanced specialist training in 2016 and became a fellow of the Royal College of Surgeons of Edinburgh.

Awards

Dr. Ong was awarded the Human Manpower Development Programme scholarship and spent a year at the prestigious St. Mark’s Hospital in the United Kingdom, specializing in inflammatory bowel disease and pelvic floor disorders. He has been a clinical lecturer at the Yong Loo Lin School of Medicine since 2012 and was awarded the title of Clinical Assistant Professor with Duke/NUS. A dedicated educator, he received the Role Model Clinical Educator Award in 2014 and the Gold Singapore Health Quality Award in 2022, 2023 and 2024.

Special Interests

Minimally invasive and robotic colorectal surgery
Inflammatory bowel disease
Pelvic floor disorders
Hernia repair

Publications

“A Minimally Invasive Surgical Approach to Synchronous Anal and Colon Adenocarcinoma: Review of Existing Literature”
Jarrod KH Tan, NZ Teo, Calvin JM Ong, Sulaiman B Yusof & R Wijaya. International Journal of Colorectal Disease. ISSN 0179-1958 DOI 10.1007/s00384-016-2572-z
“Prevalence of colorectal cancer in acute uncomplicated diverticulitis and the role of the interval colonoscopy”
Soh Nicholas YT, Chia Daryl KA, Teo NZ, Calvin JM Ong, Ramesh Wijaya. Int Journal of Colorectal Diseases PMID 29663068 DOI 10.1007/s00384-018-3039-1
“Perforated diverticulitis: is the right and left difference present here too?”
Soh Nicholas YT, Teo NZ, Carrie Jan, Shivani Rajaraman, Marianne Tsang, Calvin JM Ong, Ramesh Wijaya. Int Journal of Colorectal Diseases (2018) PMID 29532203 DOI 10.1007/s00384-018-3007-9
“Our initial experience with combined endo-laparoscopic surgery (CELS) for removal of a large benign colorectal polyp.”
Amanda Huimin See, Ong Jianming Calvin, S Yusof, R Wijaya. Asian Journal of Case Reports in Surgery 5(2):299-304, 2022; Article no.AJCRS.92097
“An interesting case of unilateral congenital bullous emphysema and protein S deficiency complicated by non-cirrhotic portal hypertension in a non-smoker”
Wenjia Pearly Koh, Jianming Calvin Ong. Chest Journal DOI https://doi.org/10.1016/j.chest.2023.07.3282
“A novel approach to a rare case of Fournier’s gangrene involving the space of Retzius”
Ong JM, Amanda See, Ramesh Wijaya, S Yusof. Asian Journal of Case Reports in Surgery 7(1):30-35. https://journalajcrs.com/index.php/AJCRS/article/view/494
“Use of Inj. Botox to the Abdominal Wall in Large Incisional Hernia Repair: A Local Experience in a Tertiary Hospital in Singapore”
Tu Irene Wen-Hui, Tirukonda Prasanna Sivanath, Sulaiman Bin Yusof, and Ong Jianming Calvin. 2024. Asian Journal of Case Reports in Surgery 7 (1):198-206. https://journalajcrs.com/index.php/AJCRS/article/view/522

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