Dr McStay graduated from Cambridge University in 1991 and St Bartholomew’s Hospital Medical School in 1994. She completed additional training as part of the North East Thames rotation in gastroenterology, which included placements at the Royal London, Royal Free, Homerton Hospital, Southend Hospital and Newham Hospital.
In addition, Dr McStay spent two years studying the role of peptide growth factors in primary liver tumours and neuroendocrine tumours at the Neuroendocrine Tumour Unit at the Royal Free Hospital. Her professional qualifications include a Master of the arts degree (MA), Fellowship of the Royal College of Physicians (FRCP) and a Doctorate of Medicine (MD), which she was awarded in 2005.
Dr McStay spent six years working as a consultant gastroenterologist at Southend Hospital before joining the Colchester team in 2011. She has special interests in capsule endoscopy, managing patients with neuroendocrine tumours and using colonoscopy to screen for bowel cancer.