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Dr. Sia Peng Ong


Dr Ong has been working as a staff specialist at Hornsby Hospital since 2005. She previously held the position of Director of Physician Training at Hornsby Hospital from 2008 to 2015.


She is an experienced Local Examiner and a member of the National Examining Panel – Adult Medicine for the Royal Australasian College of Physicians.

Dr Ong is currently the Chair of the Section of Physicians at Hornsby Hospital as well as the Chair of the Division of Medicine and Intensive Care Clinical Risk Committee. She is also actively involved in clinical teaching for medical students from the University of Sydney.​

Medical School

University of Melbourne



  • MBBS (Hons) 1997

  • FRACP – 2004

  • Other – MRCP (UK) 2003​

Areas of Special Interest

  • General gastroenterology and hepatology (in particular viral hepatitis)

  • Accreditation in gastroscopy and colonoscopy,

  • Conjoint Committee for Recognition of Training in Gastrointestinal Endoscopy

Accredited hospitals 

  • Pennant Hills Day Surgery,

  • Hornsby Ku-Ring-Gai Hospital

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