Dr Ian Johnston

Consultant Gastroenterologist


Specialises in

My main clinical interests are Nutrition and Upper GI physiology, including Gastro-Oesophageal Reflux Disease. Other work I undertake includes the management of Inflammatory Bowel Disease and Functional GI disorders such as IBS. I also perform upper and lower GI endoscopy, oesophageal manometry and pH studies and BRAVO capsule placement and interpretation.

I was awarded my MD by Imperial College London based on research into Bile Acid Diarrhoea. My work has been presented at National and International meetings at which it has been awarded prizes. As part of this research, I set up and ran a drug trial, the results of which have been published in peer reviewed journals. I continue to contribute to Bile Acid Diarrhoea and IBD research.

I gained my medical degree from the University of Edinburgh in 2002. I moved to London to continue my medical training and was awarded membership of the Royal College of Physicians in 2005. I performed my Gastroenterology Specialty training in London working at St George’s, Hammersmith and St Mark’s Hospitals in addition to several District General Hospitals. I completed my training in 2014 and took up my substantive Consultant position at St Mark’s in January 2015.


Treatment information

Some of the principal treatments carried out by Dr Ian Johnston at Spire include:


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Additional information

Bowel disease
Gastrointestinal cancer
Inflammatory bowel disease
Motility disorder

MBChB / University of Edinburgh / 2002
Bachelor of Medicine, Bachelor of Surgery

Professional memberships

Royal College of Physicians, London

British Society of Gastroenterology


Characterizing Factors Associated With Differences in FGF19 Blood Levels and Synthesis in Patients With Primary Bile Acid Diarrhea

I am a father of three children. In my spare time I enjoy running in the beautiful Chiltern countryside. In 2017 I ran the London Marathon raising money for the charity Beating Bowel Cancer.