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Formerly St Helens and Knowsley Teaching Hospitals NHS Trust

Our Services A - Z - Gastrointestinal (GI) Physiology

About the service

The Gastrointestinal (GI) Physiology Unit is located within the Endoscopy Department at St Helens Hospital. We provide diagnostic investigations to assess the function of the GI tract.

The unit supports the Gastroenterology service through the investigation and management of patients with symptoms of:

  • Dysphagia
  • Gastroesophageal reflux disease
  • Non-cardiac chest pain
  • Faecal Incontinence
  • Obstructive defaecation
  • Chronic constipation

Patients primarily attend for appointments in the outpatient setting and are investigated using state of the art equipment, to measure acid reflux and/or assess muscle pressure in the oesophagus, stomach or anorectum. Patients may be referred to the GI Physiology unit for the following investigations:

  • High Resolution Oesophageal Manometry
  • High Resolution Anorectal Manometry
  • Ambulatory 24hr pH / impedance studies
  • Capsule Endoscopy (See Endoscopy)

The unit is led by Gemma Norris (Clinical Scientist) with specialist support from Dr Katie Clark (Consultant Gastroenterologist) and Dr David McClements (Consultant Gastroenterologist).


Page last updated on 10th May 2022

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