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Andrew Day trained in paediatrics in Christchurch and undertook further subspeciality training in Toronto, Canada.

After completing clinical and research training in Canada, Professor Day took up a clinical academic position at University of New South Wales, Sydney, Australia.

He returned to UOC in 2009 and was Head of Department from 2010 to 2020.

Professor Day is a paediatric gastroenterologist based at Christchurch Hospital.

Research interests

Projects focus

Publications

Ritchie, K., Vernon-Roberts, A., & Day, A. S. (2025). Role of noncontrast enhanced abdominal ultrasound in the diagnostic assessment of pediatric inflammatory bowel disease. Journal of Pediatric Gastroenterology & Nutrition. Advance online publication. doi: 10.1002/jpn3.70044 Journal - Research Article

Huang, H., Li, P., Vernon-Roberts, A., Day, A. S., Liu, B., Wu, Z., … Wang, H. (2025). The Inflammatory Bowel Disease Knowledge Inventory Device 2 (IBD-KID2) is an effective tool for measuring disease-specific knowledge in Chinese patients. PLoS ONE, 20(4), e0321036. doi: 10.1371/journal.pone.0321036 Journal - Research Article

Prados, A., Sigall-Boneh, R., Gold, S., Haskey, N., Day, A., Beall, K., On behalf of the Medical Advisory Board of Nutritional Therapy for IBD. (2025). Nutritional therapy for IBD: A new non-profit organization that offers trusted, evidence-based information and novel resources on diet and nutritional therapies in IBD. Journal of Crohn's & Colitis, 19(Suppl. 1), (pp. i1201-i1202). doi: 10.1093/ecco-jcc/jjae190.0145 Conference Contribution - Published proceedings: Abstract

Vernon-Roberts, A., & Day, A. S. (2025). Do population migrations affect the incidence, severity, and outcomes of inflammatory bowel disease? [Concise commentary]. Digestive Diseases & Sciences. Advance online publication. doi: 10.1007/s10620-025-08972-6 Journal - Research Other

O'Donnell, J. E. M., Leach, S. T., Bowcock, N. L., Chen, S., Gupta, N., Jiang, K., … Day, A. S., & Lemberg, D. A. (2025). Daily vitamin D3 versus stoss vitamin D3 for correction of 25OHD deficiency in children with inflammatory bowel disease: A randomised controlled trial. Digestive Diseases & Sciences. Advance online publication. doi: 10.1007/s10620-025-08913-3 Journal - Research Article

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