Dr Ian Johnston

Consultant Gastroenterologist

Practising at

Spire Thames Valley Hospital

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Treatment information

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


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Professional profile

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

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

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

Clinical Interests

Bowel disease
Gastrointestinal cancer
Inflammatory bowel disease
Motility disorder

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Qualification and professional memberships

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

Professional memberships

Royal College of Physicians, London
British Society of Gastroenterology

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Research and Publication


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

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Personal Profile

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.

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Private contact details

Telephone 07305 836178
Private secretary Ann Dickinson
Private secretary telephone 07305 836178
Private secretary email