As a teenager, she went to the Salvation Army Home for the Aged to help feed the elderly. There she learnt the importance of speaking different languages and dialects.
Already fluent in French, the then-medical undergrad started picking up Arabic in 1992. Her Palestinian tutor kick-started her first solo volunteer project by putting her in touch with a friend who ran a rehabilitation centre in the West Bank.
Her post-specialisation fellowship in trauma was done at John Hunter Hospital, New South Wales in Australia. In 2001, she joined MSF as a nutrition doctor and was posted to Kuito, a town in Central Angola the size of Toa Payoh but swamped with an estimated 150,000 people fleeing the civil war.
In 2002, Dr Wong became the first Singaporean to join the International Committee of the Red Cross (ICRC) to Nepal to assess the impact of civil war on medical services and give support to health posts and hospitals. After graduating from Cambridge, she joined humanitarian aid organisation Doctors without Borders (Medecins Sans Frontieres) and the International Committee of the Red Cross to work in Third World countries and was sent to Angola in 2003. Between overseas missions, she worked with the HCA home hospice care and later served on its council as its volunteer committee chairman.
After 10 months in Nepal and four years of relief work, she returned home to resume surgical training. She studied for a Masters at John Hopkins School of Public Health, with a focus on trauma systems and access to healthcare. Her research interests include trauma systems development and inter-disciplinary continuity of care and surgery in advanced cancer.