Dr Rathnayaka graduated from the University of Peradeniya, Sri Lanka in 1997. After completing a fellowship at the Colombo University in Sri Lanka she came to Australia to complete her training and fellowship with the Royal Australian and New Zealand College of Obstetricians and Gynaecologists in Queensland and Victoria.

After completing her fellowship in 2013 Dr Rathnayaka moved to Perth where she worked at Swan District Hospital before transferring to St John of God Midland Public and Private Hospitals to work as a senior Obstetrican and Gynaecologist.

Dr Rathnayaka has presented at many international scientific meetings and has a keen passion for teaching. 

Dr Rathnayaka offers many services including: management of cervical conditions such as abnormal pap smears, colposcopy, abnormal uterine or menstrual bleeding, hysteroscopy, endometrial ablation, pelvic and abdominal pain, ovarian cysts, vaginal prolapse, post menopausal issues and early pregnancy issues.